56515100666 has 8 divisors (see below), whose sum is σ = 84789549684. Its totient is φ = 28251917440.

The previous prime is 56515100657. The next prime is 56515100689. The reversal of 56515100666 is 66600151565.

It can be written as a sum of positive squares in 2 ways, for example, as 40098060025 + 16417040641 = 200245^2 + 128129^2 .

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

It is a super-2 number, since 2×56515100666² (a number of 22 digits) contains 22 as substring.

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, 2803895 + ... + 2823978.

Almost surely, 2^56515100666 is an apocalyptic number.

56515100666 is a deficient number, since it is larger than the sum of its proper divisors (28274449018).

56515100666 is a wasteful number, since it uses less digits than its factorization.

56515100666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632896.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 56515100666 in words is "fifty-six billion, five hundred fifteen million, one hundred thousand, six hundred sixty-six".