669256652965 has 4 divisors (see below), whose sum is σ = 803107983564. Its totient is φ = 535405322368.

The previous prime is 669256652941. The next prime is 669256652971. The reversal of 669256652965 is 569256652966.

669256652965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71378205889 + 597878447076 = 267167^2 + 773226^2 .

It is a cyclic number.

It is not a de Polignac number, because 669256652965 - 2⁷ = 669256652837 is a prime.

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 669256652965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66925665292 + ... + 66925665301.

It is an arithmetic number, because the mean of its divisors is an integer number (200776995891).

Almost surely, 2^669256652965 is an apocalyptic number.

It is an amenable number.

669256652965 is a deficient number, since it is larger than the sum of its proper divisors (133851330599).

669256652965 is a wasteful number, since it uses less digits than its factorization.

669256652965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133851330598.

The product of its digits is 314928000, while the sum is 67.

Subtracting from 669256652965 its reverse (569256652966), we obtain a palindrome (99999999999).

The spelling of 669256652965 in words is "six hundred sixty-nine billion, two hundred fifty-six million, six hundred fifty-two thousand, nine hundred sixty-five".