857491780608 has 66 divisors (see below), whose sum is σ = 2475988934354. Its totient is φ = 285830590464.

The previous prime is 857491780601. The next prime is 857491780679. The reversal of 857491780608 is 806087194758.

857491780608 is a `hidden beast` number, since 8 + 5 + 7 + 4 + 9 + 17 + 8 + 0 + 608 = 666.

It can be written as a sum of positive squares in only one way, i.e., 527703450624 + 329788329984 = 726432^2 + 574272^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857491780601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46512691 + ... + 46531122.

Almost surely, 2^857491780608 is an apocalyptic number.

It is an amenable number.

857491780608 is an abundant number, since it is smaller than the sum of its proper divisors (1618497153746).

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

857491780608 is a wasteful number, since it uses less digits than its factorization.

857491780608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93043839 (or 93043818 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 63.

The spelling of 857491780608 in words is "eight hundred fifty-seven billion, four hundred ninety-one million, seven hundred eighty thousand, six hundred eight".