857666384844 has 24 divisors (see below), whose sum is σ = 2008293026880. Its totient is φ = 284878586064.

The previous prime is 857666384801. The next prime is 857666384849. The reversal of 857666384844 is 448483666758.

It is not an unprimeable number, because it can be changed into a prime (857666384849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126272574 + ... + 126279365.

It is an arithmetic number, because the mean of its divisors is an integer number (83678876120).

Almost surely, 2^857666384844 is an apocalyptic number.

It is an amenable number.

857666384844 is an abundant number, since it is smaller than the sum of its proper divisors (1150626642036).

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

857666384844 is a wasteful number, since it uses less digits than its factorization.

857666384844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252552229 (or 252552227 counting only the distinct ones).

The product of its digits is 743178240, while the sum is 69.

The spelling of 857666384844 in words is "eight hundred fifty-seven billion, six hundred sixty-six million, three hundred eighty-four thousand, eight hundred forty-four".