857666384900 has 72 divisors (see below), whose sum is σ = 2004477746880. Its totient is φ = 316648794240.

The previous prime is 857666384891. The next prime is 857666384903. The reversal of 857666384900 is 9483666758.

It is not an unprimeable number, because it can be changed into a prime (857666384903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19893167 + ... + 19936233.

Almost surely, 2^857666384900 is an apocalyptic number.

It is an amenable number.

857666384900 is an abundant number, since it is smaller than the sum of its proper divisors (1146811361980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857666384900 is a wasteful number, since it uses less digits than its factorization.

857666384900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58413 (or 58406 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 62.

The spelling of 857666384900 in words is "eight hundred fifty-seven billion, six hundred sixty-six million, three hundred eighty-four thousand, nine hundred".