56861312138 has 32 divisors (see below), whose sum is σ = 88971961680. Its totient is φ = 27236252160.

The previous prime is 56861312119. The next prime is 56861312197. The reversal of 56861312138 is 83121316865.

It can be written as a sum of positive squares in 8 ways, for example, as 25505048209 + 31356263929 = 159703^2 + 177077^2 .

It is a super-2 number, since 2×56861312138² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 853748 + ... + 917936.

Almost surely, 2^56861312138 is an apocalyptic number.

56861312138 is a deficient number, since it is larger than the sum of its proper divisors (32110649542).

56861312138 is a wasteful number, since it uses less digits than its factorization.

56861312138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64442.

The product of its digits is 207360, while the sum is 44.

The spelling of 56861312138 in words is "fifty-six billion, eight hundred sixty-one million, three hundred twelve thousand, one hundred thirty-eight".