16635556007656 has 16 divisors (see below), whose sum is σ = 31618950632100. Its totient is φ = 8203835839104.

The previous prime is 16635556007617. The next prime is 16635556007687. The reversal of 16635556007656 is 65670065553661.

It can be written as a sum of positive squares in 2 ways, for example, as 16039624502500 + 595931505156 = 4004950^2 + 771966^2 .

It is a super-2 number, since 2×16635556007656² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16635556007594 and 16635556007603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14242769971 + ... + 14242771138.

Almost surely, 2^{16635556007656} is an apocalyptic number.

It is an amenable number.

16635556007656 is a deficient number, since it is larger than the sum of its proper divisors (14983394624444).

16635556007656 is a wasteful number, since it uses less digits than its factorization.

16635556007656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28485541188 (or 28485541184 counting only the distinct ones).

The product of its (nonzero) digits is 102060000, while the sum is 61.

The spelling of 16635556007656 in words is "sixteen trillion, six hundred thirty-five billion, five hundred fifty-six million, seven thousand, six hundred fifty-six".