665665395 has 16 divisors (see below), whose sum is σ = 1077898752. Its totient is φ = 350743520.

The previous prime is 665665373. The next prime is 665665417. The reversal of 665665395 is 593566566.

It is an interprime number because it is at equal distance from previous prime (665665373) and next prime (665665417).

It is not a de Polignac number, because 665665395 - 2⁶ = 665665331 is a prime.

It is a super-2 number, since 2×665665395² = 886220836201012050, which contains 22 as substring.

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, 266091 + ... + 268580.

It is an arithmetic number, because the mean of its divisors is an integer number (67368672).

Almost surely, 2^665665395 is an apocalyptic number.

665665395 is a deficient number, since it is larger than the sum of its proper divisors (412233357).

665665395 is a wasteful number, since it uses less digits than its factorization.

665665395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534762.

The product of its digits is 4374000, while the sum is 51.

The square root of 665665395 is about 25800.4921464688. The cubic root of 665665395 is about 873.1428999186.

The spelling of 665665395 in words is "six hundred sixty-five million, six hundred sixty-five thousand, three hundred ninety-five".