669634436965 has 64 divisors (see below), whose sum is σ = 918863366400. Its totient is φ = 464398147584.

The previous prime is 669634436923. The next prime is 669634436971. The reversal of 669634436965 is 569634436966.

It is a cyclic number.

It is not a de Polignac number, because 669634436965 - 2⁷ = 669634436837 is a prime.

It is a super-2 number, since 2×669634436965² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 669634436965.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129947829 + ... + 129952981.

It is an arithmetic number, because the mean of its divisors is an integer number (14357240100).

Almost surely, 2^669634436965 is an apocalyptic number.

669634436965 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

669634436965 is a deficient number, since it is larger than the sum of its proper divisors (249228929435).

669634436965 is a wasteful number, since it uses less digits than its factorization.

669634436965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086.

The product of its digits is 453496320, while the sum is 67.

Subtracting from 669634436965 its reverse (569634436966), we obtain a palindrome (99999999999).

The spelling of 669634436965 in words is "six hundred sixty-nine billion, six hundred thirty-four million, four hundred thirty-six thousand, nine hundred sixty-five".