861557755168 has 48 divisors (see below), whose sum is σ = 1850510581920. Its totient is φ = 391591872000.

The previous prime is 861557755139. The next prime is 861557755183.

861557755168 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6054823 + ... + 6195481.

It is an arithmetic number, because the mean of its divisors is an integer number (38552303790).

Almost surely, 2^861557755168 is an apocalyptic number.

861557755168 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

861557755168 is an abundant number, since it is smaller than the sum of its proper divisors (988952826752).

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

861557755168 is a wasteful number, since it uses less digits than its factorization.

861557755168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158081 (or 158073 counting only the distinct ones).

The product of its digits is 70560000, while the sum is 64.

The spelling of 861557755168 in words is "eight hundred sixty-one billion, five hundred fifty-seven million, seven hundred fifty-five thousand, one hundred sixty-eight".