857666384918 has 128 divisors (see below), whose sum is σ = 1560481628160. Its totient is φ = 345877724160.

The previous prime is 857666384903. The next prime is 857666384959. The reversal of 857666384918 is 819483666758.

857666384918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 602716355 + ... + 602717777.

It is an arithmetic number, because the mean of its divisors is an integer number (12191262720).

Almost surely, 2^857666384918 is an apocalyptic number.

857666384918 is a deficient number, since it is larger than the sum of its proper divisors (702815243242).

857666384918 is a wasteful number, since it uses less digits than its factorization.

857666384918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802.

The product of its digits is 418037760, while the sum is 71.

The spelling of 857666384918 in words is "eight hundred fifty-seven billion, six hundred sixty-six million, three hundred eighty-four thousand, nine hundred eighteen".