669565624320 has 672 divisors, whose sum is σ = 2382979435200. Its totient is φ = 173861240832.

The previous prime is 669565624271. The next prime is 669565624363. The reversal of 669565624320 is 23426565966.

669565624320 is a `hidden beast` number, since 6 + 6 + 9 + 5 + 6 + 5 + 624 + 3 + 2 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3740589991 + ... + 3740590169.

It is an arithmetic number, because the mean of its divisors is an integer number (3546100350).

Almost surely, 2^669565624320 is an apocalyptic number.

669565624320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669565624320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1191489717600).

669565624320 is an abundant number, since it is smaller than the sum of its proper divisors (1713413810880).

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

669565624320 is a wasteful number, since it uses less digits than its factorization.

669565624320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 54.

The spelling of 669565624320 in words is "six hundred sixty-nine billion, five hundred sixty-five million, six hundred twenty-four thousand, three hundred twenty".