669961639200 has 144 divisors (see below), whose sum is σ = 2492257360320. Its totient is φ = 153134085120.

The previous prime is 669961639199. The next prime is 669961639223. The reversal of 669961639200 is 2936169966.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19922535 + ... + 19956134.

It is an arithmetic number, because the mean of its divisors is an integer number (17307342780).

Almost surely, 2^669961639200 is an apocalyptic number.

669961639200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669961639200 is an abundant number, since it is smaller than the sum of its proper divisors (1822295721120).

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

669961639200 is a wasteful number, since it uses less digits than its factorization.

669961639200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39878699 (or 39878686 counting only the distinct ones).

The product of its (nonzero) digits is 5668704, while the sum is 57.

The spelling of 669961639200 in words is "six hundred sixty-nine billion, nine hundred sixty-one million, six hundred thirty-nine thousand, two hundred".