56916121986 has 32 divisors (see below), whose sum is σ = 128368044480. Its totient is φ = 18688874688.

The previous prime is 56916121963. The next prime is 56916121987. The reversal of 56916121986 is 68912161965.

56916121986 is a `hidden beast` number, since 5 + 6 + 9 + 1 + 612 + 19 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (56916121987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7862071 + ... + 7869306.

It is an arithmetic number, because the mean of its divisors is an integer number (4011501390).

Almost surely, 2^56916121986 is an apocalyptic number.

56916121986 is an abundant number, since it is smaller than the sum of its proper divisors (71451922494).

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

56916121986 is a wasteful number, since it uses less digits than its factorization.

56916121986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15731455 (or 15731449 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The spelling of 56916121986 in words is "fifty-six billion, nine hundred sixteen million, one hundred twenty-one thousand, nine hundred eighty-six".