56861617518 has 24 divisors (see below), whose sum is σ = 127763141688. Its totient is φ = 18953872344.

The previous prime is 56861617481. The next prime is 56861617567. The reversal of 56861617518 is 81571616865.

It is a happy number.

56861617518 is a `hidden beast` number, since 5 + 6 + 8 + 6 + 1 + 617 + 5 + 18 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58499121 + ... + 58500092.

It is an arithmetic number, because the mean of its divisors is an integer number (5323464237).

Almost surely, 2^56861617518 is an apocalyptic number.

56861617518 is an abundant number, since it is smaller than the sum of its proper divisors (70901524170).

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

56861617518 is a wasteful number, since it uses less digits than its factorization.

56861617518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116999230 (or 116999218 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The spelling of 56861617518 in words is "fifty-six billion, eight hundred sixty-one million, six hundred seventeen thousand, five hundred eighteen".