153851004661561 has 3 divisors (see below), whose sum is σ = 153851017065231. Its totient is φ = 153850992257892.

The previous prime is 153851004661531. The next prime is 153851004661591. The reversal of 153851004661561 is 165166400158351.

The square root of 153851004661561 is 12403669.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (153851004661531) and next prime (153851004661591).

It can be written as a sum of positive squares in only one way, i.e., 150765712411561 + 3085292250000 = 12278669^2 + 1756500^2 .

It is not a de Polignac number, because 153851004661561 - 2⁹ = 153851004661049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 153851004661499 and 153851004661508.

It is not an unprimeable number, because it can be changed into a prime (153851004661511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6201835 + ... + 18605503.

It is an arithmetic number, because the mean of its divisors is an integer number (51283672355077).

Almost surely, 2^{153851004661561} is an apocalyptic number.

153851004661561 is the 12403669-th square number.

153851004661561 is the 6201835-th centered octagonal number.

It is an amenable number.

153851004661561 is a deficient number, since it is larger than the sum of its proper divisors (12403670).

153851004661561 is an frugal number, since it uses more digits than its factorization.

153851004661561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24807338 (or 12403669 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 52.

The spelling of 153851004661561 in words is "one hundred fifty-three trillion, eight hundred fifty-one billion, four million, six hundred sixty-one thousand, five hundred sixty-one".