866373681 has 4 divisors (see below), whose sum is σ = 1155164912. Its totient is φ = 577582452.

The previous prime is 866373661. The next prime is 866373689. The reversal of 866373681 is 186373668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 866373681 - 2⁵ = 866373649 is a prime.

It is a super-2 number, since 2×866373681² = 1501206710258979522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866373681.

It is not an unprimeable number, because it can be changed into a prime (866373689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144395611 + ... + 144395616.

It is an arithmetic number, because the mean of its divisors is an integer number (288791228).

Almost surely, 2^866373681 is an apocalyptic number.

It is an amenable number.

866373681 is a deficient number, since it is larger than the sum of its proper divisors (288791231).

866373681 is a wasteful number, since it uses less digits than its factorization.

866373681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288791230.

The product of its digits is 870912, while the sum is 48.

The square root of 866373681 is about 29434.2263530061. The cubic root of 866373681 is about 953.3120520975.

The spelling of 866373681 in words is "eight hundred sixty-six million, three hundred seventy-three thousand, six hundred eighty-one".