1661638659153 has 8 divisors (see below), whose sum is σ = 2416928958816. Its totient is φ = 1007053732800.

The previous prime is 1661638659133. The next prime is 1661638659199. The reversal of 1661638659153 is 3519568361661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1661638659153 - 2²² = 1661634464849 is a prime.

It is a super-2 number, since 2×1661638659153² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661638659133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25176343288 + ... + 25176343353.

It is an arithmetic number, because the mean of its divisors is an integer number (302116119852).

Almost surely, 2^{1661638659153} is an apocalyptic number.

It is an amenable number.

1661638659153 is a deficient number, since it is larger than the sum of its proper divisors (755290299663).

1661638659153 is a wasteful number, since it uses less digits than its factorization.

1661638659153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50352686655.

The product of its digits is 20995200, while the sum is 60.

The spelling of 1661638659153 in words is "one trillion, six hundred sixty-one billion, six hundred thirty-eight million, six hundred fifty-nine thousand, one hundred fifty-three".