857215907165 has 8 divisors (see below), whose sum is σ = 1052581393248. Its totient is φ = 669824522640.

The previous prime is 857215907161. The next prime is 857215907179. The reversal of 857215907165 is 561709512758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 857215907165 - 2² = 857215907161 is a prime.

It is a super-2 number, since 2×857215907165² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 857215907165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857215907161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1993525151 + ... + 1993525580.

It is an arithmetic number, because the mean of its divisors is an integer number (131572674156).

Almost surely, 2^857215907165 is an apocalyptic number.

It is an amenable number.

857215907165 is a deficient number, since it is larger than the sum of its proper divisors (195365486083).

857215907165 is a wasteful number, since it uses less digits than its factorization.

857215907165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987050779.

The product of its (nonzero) digits is 5292000, while the sum is 56.

The spelling of 857215907165 in words is "eight hundred fifty-seven billion, two hundred fifteen million, nine hundred seven thousand, one hundred sixty-five".