1951653442561 has 8 divisors (see below), whose sum is σ = 1954280818400. Its totient is φ = 1949026442688.

The previous prime is 1951653442517. The next prime is 1951653442573. The reversal of 1951653442561 is 1652443561591.

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

It is a cyclic number.

It is not a de Polignac number, because 1951653442561 - 2⁹ = 1951653442049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1951653442499 and 1951653442508.

It is not an unprimeable number, because it can be changed into a prime (1951653542561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11204665 + ... + 11377513.

It is an arithmetic number, because the mean of its divisors is an integer number (244285102300).

Almost surely, 2^{1951653442561} is an apocalyptic number.

It is an amenable number.

1951653442561 is a deficient number, since it is larger than the sum of its proper divisors (2627375839).

1951653442561 is a wasteful number, since it uses less digits than its factorization.

1951653442561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187983.

The product of its digits is 3888000, while the sum is 52.

The spelling of 1951653442561 in words is "one trillion, nine hundred fifty-one billion, six hundred fifty-three million, four hundred forty-two thousand, five hundred sixty-one".