56355615521 has 8 divisors (see below), whose sum is σ = 56547630720. Its totient is φ = 56163886272.

The previous prime is 56355615499. The next prime is 56355615583. The reversal of 56355615521 is 12551655365.

56355615521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 56355615521 - 2¹⁸ = 56355353377 is a prime.

It is a super-2 number, since 2×56355615521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56355605521) 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, 327116 + ... + 468738.

It is an arithmetic number, because the mean of its divisors is an integer number (7068453840).

Almost surely, 2^56355615521 is an apocalyptic number.

It is an amenable number.

56355615521 is a deficient number, since it is larger than the sum of its proper divisors (192015199).

56355615521 is a wasteful number, since it uses less digits than its factorization.

56355615521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142975.

The product of its digits is 675000, while the sum is 44.

The spelling of 56355615521 in words is "fifty-six billion, three hundred fifty-five million, six hundred fifteen thousand, five hundred twenty-one".