857868609815 has 16 divisors (see below), whose sum is σ = 1176948111360. Its totient is φ = 588031466400.

The previous prime is 857868609809. The next prime is 857868609823. The reversal of 857868609815 is 518906868758.

It is not a de Polignac number, because 857868609815 - 2²⁸ = 857600174359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4515911 + ... + 4702040.

It is an arithmetic number, because the mean of its divisors is an integer number (73559256960).

Almost surely, 2^857868609815 is an apocalyptic number.

857868609815 is a deficient number, since it is larger than the sum of its proper divisors (319079501545).

857868609815 is a wasteful number, since it uses less digits than its factorization.

857868609815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220622.

The product of its (nonzero) digits is 232243200, while the sum is 71.

The spelling of 857868609815 in words is "eight hundred fifty-seven billion, eight hundred sixty-eight million, six hundred nine thousand, eight hundred fifteen".