664957272366720 has 192 divisors, whose sum is σ = 2297945542150440. Its totient is φ = 177185640652800.

The previous prime is 664957272366703. The next prime is 664957272366731. The reversal of 664957272366720 is 27663272759466.

664957272366720 is a `hidden beast` number, since 6 + 6 + 4 + 9 + 572 + 7 + 23 + 6 + 6 + 7 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 155333148945984 + 509624123420736 = 12463272^2 + 22574856^2 .

It is a tau number, because it is divible by the number of its divisors (192).

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 23 ways as a sum of consecutive naturals, for example, 36873639 + ... + 51861158.

Almost surely, 2^{664957272366720} is an apocalyptic number.

664957272366720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664957272366720 is an abundant number, since it is smaller than the sum of its proper divisors (1632988269783720).

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

664957272366720 is a wasteful number, since it uses less digits than its factorization.

664957272366720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88736123 (or 88736108 counting only the distinct ones).

The product of its (nonzero) digits is 1920360960, while the sum is 72.

The spelling of 664957272366720 in words is "six hundred sixty-four trillion, nine hundred fifty-seven billion, two hundred seventy-two million, three hundred sixty-six thousand, seven hundred twenty".