866891670674 has 4 divisors (see below), whose sum is σ = 1300337506014. Its totient is φ = 433445835336.

The previous prime is 866891670647. The next prime is 866891670703. The reversal of 866891670674 is 476076198668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 679841475625 + 187050195049 = 824525^2 + 432493^2 .

It is a super-2 number, since 2×866891670674² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216722917667 + ... + 216722917670.

Almost surely, 2^866891670674 is an apocalyptic number.

866891670674 is a deficient number, since it is larger than the sum of its proper divisors (433445835340).

866891670674 is a wasteful number, since it uses less digits than its factorization.

866891670674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433445835339.

The product of its (nonzero) digits is 146313216, while the sum is 68.

The spelling of 866891670674 in words is "eight hundred sixty-six billion, eight hundred ninety-one million, six hundred seventy thousand, six hundred seventy-four".