856926665 has 16 divisors (see below), whose sum is σ = 1179798912. Its totient is φ = 585314304.

The previous prime is 856926647. The next prime is 856926671. The reversal of 856926665 is 566629658.

856926665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856926665 is a prime.

It is a Duffinian number.

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, 38639 + ... + 56628.

It is an arithmetic number, because the mean of its divisors is an integer number (73737432).

Almost surely, 2^856926665 is an apocalyptic number.

It is an amenable number.

856926665 is a deficient number, since it is larger than the sum of its proper divisors (322872247).

856926665 is a wasteful number, since it uses less digits than its factorization.

856926665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95536.

The product of its digits is 4665600, while the sum is 53.

The square root of 856926665 is about 29273.3097718724. The cubic root of 856926665 is about 949.8343811007.

The spelling of 856926665 in words is "eight hundred fifty-six million, nine hundred twenty-six thousand, six hundred sixty-five".