666332418656 has 48 divisors (see below), whose sum is σ = 1348871299776. Its totient is φ = 323782972416.

The previous prime is 666332418601. The next prime is 666332418673. The reversal of 666332418656 is 656814233666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686345 + ... + 1343031.

It is an arithmetic number, because the mean of its divisors is an integer number (28101485412).

Almost surely, 2^666332418656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666332418656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674435649888).

666332418656 is an abundant number, since it is smaller than the sum of its proper divisors (682538881120).

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

666332418656 is a wasteful number, since it uses less digits than its factorization.

666332418656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657591 (or 657583 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 56.

The spelling of 666332418656 in words is "six hundred sixty-six billion, three hundred thirty-two million, four hundred eighteen thousand, six hundred fifty-six".