666989836800 has 480 divisors, whose sum is σ = 2579585145984. Its totient is φ = 148733952000.

The previous prime is 666989836789. The next prime is 666989836861. The reversal of 666989836800 is 8638989666.

It is a tau number, because it is divible by the number of its divisors (480).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10990540 + ... + 11051060.

Almost surely, 2^666989836800 is an apocalyptic number.

666989836800 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 666989836800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1289792572992).

666989836800 is an abundant number, since it is smaller than the sum of its proper divisors (1912595309184).

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

666989836800 is a wasteful number, since it uses less digits than its factorization.

666989836800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60600 (or 60579 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 69.

The spelling of 666989836800 in words is "six hundred sixty-six billion, nine hundred eighty-nine million, eight hundred thirty-six thousand, eight hundred".