665656353279 has 6 divisors (see below), whose sum is σ = 961503621416. Its totient is φ = 443770902180.

The previous prime is 665656353247. The next prime is 665656353293. The reversal of 665656353279 is 972353656566.

665656353279 is a `hidden beast` number, since 6 + 6 + 5 + 6 + 5 + 6 + 353 + 279 = 666.

It is not a de Polignac number, because 665656353279 - 2⁵ = 665656353247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665656353239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36980908507 + ... + 36980908524.

Almost surely, 2^665656353279 is an apocalyptic number.

665656353279 is a deficient number, since it is larger than the sum of its proper divisors (295847268137).

665656353279 is a wasteful number, since it uses less digits than its factorization.

665656353279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73961817037 (or 73961817034 counting only the distinct ones).

The product of its digits is 183708000, while the sum is 63.

The spelling of 665656353279 in words is "six hundred sixty-five billion, six hundred fifty-six million, three hundred fifty-three thousand, two hundred seventy-nine".