866761277574138 has 32 divisors (see below), whose sum is σ = 1810533076955136. Its totient is φ = 276108116333808.

The previous prime is 866761277574113. The next prime is 866761277574187. The reversal of 866761277574138 is 831475772167668.

It is a super-2 number, since 2×866761277574138² (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 15 ways as a sum of consecutive naturals, for example, 2847027670 + ... + 2847332097.

It is an arithmetic number, because the mean of its divisors is an integer number (56579158654848).

Almost surely, 2^{866761277574138} is an apocalyptic number.

866761277574138 is an abundant number, since it is smaller than the sum of its proper divisors (943771799380998).

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

866761277574138 is a wasteful number, since it uses less digits than its factorization.

866761277574138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5694360898.

The product of its digits is 3982970880, while the sum is 78.

The spelling of 866761277574138 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred seventy-seven million, five hundred seventy-four thousand, one hundred thirty-eight".