666804648960 has 880 divisors, whose sum is σ = 2546618659200. Its totient is φ = 166259589120.

The previous prime is 666804648941. The next prime is 666804649037. The reversal of 666804648960 is 69846408666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1910614866 + ... + 1910615214.

It is an arithmetic number, because the mean of its divisors is an integer number (2893884840).

Almost surely, 2^666804648960 is an apocalyptic number.

666804648960 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 666804648960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273309329600).

666804648960 is an abundant number, since it is smaller than the sum of its proper divisors (1879814010240).

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

666804648960 is a wasteful number, since it uses less digits than its factorization.

666804648960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 63.

The spelling of 666804648960 in words is "six hundred sixty-six billion, eight hundred four million, six hundred forty-eight thousand, nine hundred sixty".