56660155566 has 16 divisors (see below), whose sum is σ = 129508927104. Its totient is φ = 16188615864.

The previous prime is 56660155553. The next prime is 56660155571. The reversal of 56660155566 is 66555106665.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674525620 + ... + 674525703.

It is an arithmetic number, because the mean of its divisors is an integer number (8094307944).

Almost surely, 2^56660155566 is an apocalyptic number.

56660155566 is an abundant number, since it is smaller than the sum of its proper divisors (72848771538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56660155566 is a wasteful number, since it uses less digits than its factorization.

56660155566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349051335.

The product of its (nonzero) digits is 4860000, while the sum is 51.

It can be divided in two parts, 56660 and 155566, that added together give a triangular number (212226 = T₆₅₁).

The spelling of 56660155566 in words is "fifty-six billion, six hundred sixty million, one hundred fifty-five thousand, five hundred sixty-six".