666783648000 has 432 divisors, whose sum is σ = 2402443819776. Its totient is φ = 177574809600.

The previous prime is 666783647987. The next prime is 666783648043. The reversal of 666783648000 is 846387666.

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, 409823187 + ... + 409824813.

Almost surely, 2^666783648000 is an apocalyptic number.

666783648000 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 666783648000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201221909888).

666783648000 is an abundant number, since it is smaller than the sum of its proper divisors (1735660171776).

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

666783648000 is a wasteful number, since it uses less digits than its factorization.

666783648000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087 (or 3060 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 666783648000 in words is "six hundred sixty-six billion, seven hundred eighty-three million, six hundred forty-eight thousand".