866786274765864 has 48 divisors (see below), whose sum is σ = 2368320905632500. Its totient is φ = 286371866586624.

The previous prime is 866786274765773. The next prime is 866786274765911. The reversal of 866786274765864 is 468567472687668.

866786274765864 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 6 + 27 + 476 + 58 + 64 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 566788009436100 + 299998265329764 = 23807310^2 + 17320458^2 .

It is a super-2 number, since 2×866786274765864² (a number of 31 digits) contains 22 as substring.

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, 53268568239 + ... + 53268584510.

Almost surely, 2^{866786274765864} is an apocalyptic number.

It is an amenable number.

866786274765864 is an abundant number, since it is smaller than the sum of its proper divisors (1501534630866636).

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

866786274765864 is a wasteful number, since it uses less digits than its factorization.

866786274765864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106537152874 (or 106537152867 counting only the distinct ones).

The product of its digits is 218494402560, while the sum is 90.

The spelling of 866786274765864 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-four million, seven hundred sixty-five thousand, eight hundred sixty-four".