665264655 has 72 divisors (see below), whose sum is σ = 1342229616. Its totient is φ = 303536640.

The previous prime is 665264617. The next prime is 665264683. The reversal of 665264655 is 556462566.

It is a happy number.

665264655 is a `hidden beast` number, since 66 + 526 + 4 + 65 + 5 = 666.

665264655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665264655 - 2⁸ = 665264399 is a prime.

It is a super-2 number, since 2×665264655² = 885154122384538050, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 665264655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 88972 + ... + 96158.

It is an arithmetic number, because the mean of its divisors is an integer number (18642078).

Almost surely, 2^665264655 is an apocalyptic number.

665264655 is an abundant number, since it is smaller than the sum of its proper divisors (676964961).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665264655 is a wasteful number, since it uses less digits than its factorization.

665264655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7237 (or 7223 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The square root of 665264655 is about 25792.7248463593. The cubic root of 665264655 is about 872.9676499469.

The spelling of 665264655 in words is "six hundred sixty-five million, two hundred sixty-four thousand, six hundred fifty-five".