8257012857 has 16 divisors (see below), whose sum is σ = 12764465280. Its totient is φ = 5265341136.

The previous prime is 8257012847. The next prime is 8257012867. The reversal of 8257012857 is 7582107528.

8257012857 is a `hidden beast` number, since 8 + 2 + 570 + 1 + 28 + 57 = 666.

It is an interprime number because it is at equal distance from previous prime (8257012847) and next prime (8257012867).

It is not a de Polignac number, because 8257012857 - 2⁶ = 8257012793 is a prime.

It is a super-2 number, since 2×8257012857² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8257012817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6647538 + ... + 6648779.

It is an arithmetic number, because the mean of its divisors is an integer number (797779080).

Almost surely, 2^8257012857 is an apocalyptic number.

It is an amenable number.

8257012857 is a deficient number, since it is larger than the sum of its proper divisors (4507452423).

8257012857 is a wasteful number, since it uses less digits than its factorization.

8257012857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13296349 (or 13296343 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 45.

The square root of 8257012857 is about 90868.1069297694. The cubic root of 8257012857 is about 2021.1923863091.

The spelling of 8257012857 in words is "eight billion, two hundred fifty-seven million, twelve thousand, eight hundred fifty-seven".