56811855978 has 48 divisors (see below), whose sum is σ = 128224002816. Its totient is φ = 18852328800.

The previous prime is 56811855949. The next prime is 56811856009. The reversal of 56811855978 is 87955811865.

56811855978 is a `hidden beast` number, since 5 + 6 + 8 + 1 + 1 + 8 + 559 + 78 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153723 + ... + 370478.

It is an arithmetic number, because the mean of its divisors is an integer number (2671333392).

Almost surely, 2^56811855978 is an apocalyptic number.

56811855978 is an abundant number, since it is smaller than the sum of its proper divisors (71412146838).

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

56811855978 is a wasteful number, since it uses less digits than its factorization.

56811855978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524441 (or 524429 counting only the distinct ones).

The product of its digits is 24192000, while the sum is 63.

The spelling of 56811855978 in words is "fifty-six billion, eight hundred eleven million, eight hundred fifty-five thousand, nine hundred seventy-eight".