857129453956 has 24 divisors (see below), whose sum is σ = 1578983868000. Its totient is φ = 405992954304.

The previous prime is 857129453909. The next prime is 857129453963. The reversal of 857129453956 is 659354921758.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1888200 + ... + 2297728.

It is an arithmetic number, because the mean of its divisors is an integer number (65790994500).

Almost surely, 2^857129453956 is an apocalyptic number.

It is an amenable number.

857129453956 is a deficient number, since it is larger than the sum of its proper divisors (721854414044).

857129453956 is a wasteful number, since it uses less digits than its factorization.

857129453956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437091 (or 437089 counting only the distinct ones).

The product of its digits is 81648000, while the sum is 64.

The spelling of 857129453956 in words is "eight hundred fifty-seven billion, one hundred twenty-nine million, four hundred fifty-three thousand, nine hundred fifty-six".