915913665 has 24 divisors (see below), whose sum is σ = 1597708008. Its totient is φ = 485372160.

The previous prime is 915913657. The next prime is 915913679. The reversal of 915913665 is 566319519.

It can be written as a sum of positive squares in 4 ways, for example, as 3969 + 915909696 = 63^2 + 30264^2 .

It is not a de Polignac number, because 915913665 - 2³ = 915913657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 915913665.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57756 + ... + 71885.

It is an arithmetic number, because the mean of its divisors is an integer number (66571167).

Almost surely, 2^915913665 is an apocalyptic number.

It is an amenable number.

915913665 is a deficient number, since it is larger than the sum of its proper divisors (681794343).

915913665 is a wasteful number, since it uses less digits than its factorization.

915913665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129809 (or 129806 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 915913665 is about 30264.0655728869. The cubic root of 915913665 is about 971.1467166052.

The spelling of 915913665 in words is "nine hundred fifteen million, nine hundred thirteen thousand, six hundred sixty-five".