669418685 has 32 divisors (see below), whose sum is σ = 890749440. Its totient is φ = 479808000.

The previous prime is 669418679. The next prime is 669418691. The reversal of 669418685 is 586814966.

It is an interprime number because it is at equal distance from previous prime (669418679) and next prime (669418691).

It is not a de Polignac number, because 669418685 - 2²⁶ = 602309821 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636410 + ... + 637460.

It is an arithmetic number, because the mean of its divisors is an integer number (27835920).

Almost surely, 2^669418685 is an apocalyptic number.

669418685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

669418685 is a deficient number, since it is larger than the sum of its proper divisors (221330755).

669418685 is a wasteful number, since it uses less digits than its factorization.

669418685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349.

The product of its digits is 2488320, while the sum is 53.

The square root of 669418685 is about 25873.1266954730. The cubic root of 669418685 is about 874.7808692082.

The spelling of 669418685 in words is "six hundred sixty-nine million, four hundred eighteen thousand, six hundred eighty-five".