86391971556 has 36 divisors (see below), whose sum is σ = 221572801296. Its totient is φ = 26179384880.

The previous prime is 86391971507. The next prime is 86391971579. The reversal of 86391971556 is 65517919368.

It is a super-2 number, since 2×86391971556² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 86391971556.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29747850 + ... + 29750753.

It is an arithmetic number, because the mean of its divisors is an integer number (6154800036).

Almost surely, 2^86391971556 is an apocalyptic number.

It is an amenable number.

86391971556 is an abundant number, since it is smaller than the sum of its proper divisors (135180829740).

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

86391971556 is a wasteful number, since it uses less digits than its factorization.

86391971556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59498632 (or 59498619 counting only the distinct ones).

The product of its digits is 12247200, while the sum is 60.

The spelling of 86391971556 in words is "eighty-six billion, three hundred ninety-one million, nine hundred seventy-one thousand, five hundred fifty-six".