666583796736 has 352 divisors, whose sum is σ = 2319234624000. Its totient is φ = 186455900160.

The previous prime is 666583796701. The next prime is 666583796743. The reversal of 666583796736 is 637697385666.

It is a tau number, because it is divible by the number of its divisors (352).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3869365 + ... + 4037963.

Almost surely, 2^666583796736 is an apocalyptic number.

666583796736 is a gapful number since it is divisible by the number (66) 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 666583796736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159617312000).

666583796736 is an abundant number, since it is smaller than the sum of its proper divisors (1652650827264).

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

666583796736 is a wasteful number, since it uses less digits than its factorization.

666583796736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168652 (or 168628 counting only the distinct ones).

The product of its digits is 1234517760, while the sum is 72.

The spelling of 666583796736 in words is "six hundred sixty-six billion, five hundred eighty-three million, seven hundred ninety-six thousand, seven hundred thirty-six".