12857750865 has 24 divisors (see below), whose sum is σ = 23112206208. Its totient is φ = 6857466480.

The previous prime is 12857750837. The next prime is 12857750911. The reversal of 12857750865 is 56805775821.

12857750865 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 77 + 508 + 65 = 666.

It is not a de Polignac number, because 12857750865 - 2¹¹ = 12857748817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5290041 + ... + 5292470.

It is an arithmetic number, because the mean of its divisors is an integer number (963008592).

Almost surely, 2^12857750865 is an apocalyptic number.

12857750865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12857750865 is a deficient number, since it is larger than the sum of its proper divisors (10254455343).

12857750865 is an equidigital number, since it uses as much as digits as its factorization.

12857750865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10582531 (or 10582519 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 54.

The spelling of 12857750865 in words is "twelve billion, eight hundred fifty-seven million, seven hundred fifty thousand, eight hundred sixty-five".