666311533740864 has 168 divisors, whose sum is σ = 2083702288243680. Its totient is φ = 201891576499200.

The previous prime is 666311533740859. The next prime is 666311533740911. The reversal of 666311533740864 is 468047335113666.

It is a super-2 number, since 2×666311533740864² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55479574 + ... + 66412394.

Almost surely, 2^{666311533740864} is an apocalyptic number.

666311533740864 is a gapful number since it is divisible by the number (64) 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 666311533740864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041851144121840).

666311533740864 is an abundant number, since it is smaller than the sum of its proper divisors (1417390754502816).

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

666311533740864 is a wasteful number, since it uses less digits than its factorization.

666311533740864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10942469 (or 10942456 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 63.

The spelling of 666311533740864 in words is "six hundred sixty-six trillion, three hundred eleven billion, five hundred thirty-three million, seven hundred forty thousand, eight hundred sixty-four".