669813831720 has 192 divisors, whose sum is σ = 2456684380800. Its totient is φ = 156779804160.

The previous prime is 669813831719. The next prime is 669813831751. The reversal of 669813831720 is 27138318966.

669813831720 is a `hidden beast` number, since 6 + 6 + 98 + 1 + 383 + 172 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2801452 + ... + 3031131.

It is an arithmetic number, because the mean of its divisors is an integer number (12795231150).

Almost surely, 2^669813831720 is an apocalyptic number.

669813831720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669813831720 is an abundant number, since it is smaller than the sum of its proper divisors (1786870549080).

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

669813831720 is a wasteful number, since it uses less digits than its factorization.

669813831720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5832640 (or 5832633 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 669813831720 in words is "six hundred sixty-nine billion, eight hundred thirteen million, eight hundred thirty-one thousand, seven hundred twenty".