666831102720 has 576 divisors, whose sum is σ = 2292218127360. Its totient is φ = 164822777856.

The previous prime is 666831102689. The next prime is 666831102731. The reversal of 666831102720 is 27201138666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 380393364 + ... + 380395116.

It is an arithmetic number, because the mean of its divisors is an integer number (3979545360).

Almost surely, 2^666831102720 is an apocalyptic number.

666831102720 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 666831102720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146109063680).

666831102720 is an abundant number, since it is smaller than the sum of its proper divisors (1625387024640).

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

666831102720 is a wasteful number, since it uses less digits than its factorization.

666831102720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 666831102720 in words is "six hundred sixty-six billion, eight hundred thirty-one million, one hundred two thousand, seven hundred twenty".