811670138686 has 8 divisors (see below), whose sum is σ = 1328187499704. Its totient is φ = 368940972120.

The previous prime is 811670138663. The next prime is 811670138701. The reversal of 811670138686 is 686831076118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18447048585 + ... + 18447048628.

It is an arithmetic number, because the mean of its divisors is an integer number (166023437463).

Almost surely, 2^811670138686 is an apocalyptic number.

811670138686 is a deficient number, since it is larger than the sum of its proper divisors (516517361018).

811670138686 is a wasteful number, since it uses less digits than its factorization.

811670138686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36894097226.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 811670138686 in words is "eight hundred eleven billion, six hundred seventy million, one hundred thirty-eight thousand, six hundred eighty-six".