864988977591 has 48 divisors (see below), whose sum is σ = 1332056793600. Its totient is φ = 539669946816.

The previous prime is 864988977583. The next prime is 864988977599. The reversal of 864988977591 is 195779889468.

864988977591 is a `hidden beast` number, since 8 + 6 + 498 + 8 + 9 + 77 + 59 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (864988977583) and next prime (864988977599).

It is not a de Polignac number, because 864988977591 - 2³ = 864988977583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 864988977591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864988977599) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3828780 + ... + 4048398.

It is an arithmetic number, because the mean of its divisors is an integer number (27751183200).

Almost surely, 2^864988977591 is an apocalyptic number.

864988977591 is a deficient number, since it is larger than the sum of its proper divisors (467067816009).

864988977591 is a wasteful number, since it uses less digits than its factorization.

864988977591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220060 (or 220057 counting only the distinct ones).

The product of its digits is 2194698240, while the sum is 81.

The spelling of 864988977591 in words is "eight hundred sixty-four billion, nine hundred eighty-eight million, nine hundred seventy-seven thousand, five hundred ninety-one".