56861585816 has 32 divisors (see below), whose sum is σ = 122015808000. Its totient is φ = 24335340576.

The previous prime is 56861585813. The next prime is 56861585821. The reversal of 56861585816 is 61858516865.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56861585813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665846 + ... + 746373.

It is an arithmetic number, because the mean of its divisors is an integer number (3812994000).

Almost surely, 2^56861585816 is an apocalyptic number.

56861585816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

56861585816 is an abundant number, since it is smaller than the sum of its proper divisors (65154222184).

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

56861585816 is a wasteful number, since it uses less digits than its factorization.

56861585816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412951 (or 1412947 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 59.

The spelling of 56861585816 in words is "fifty-six billion, eight hundred sixty-one million, five hundred eighty-five thousand, eight hundred sixteen".