66799396728000 has 336 divisors, whose sum is σ = 243461128394016. Its totient is φ = 17477073868800.

The previous prime is 66799396727977. The next prime is 66799396728041. The reversal of 66799396728000 is 82769399766.

66799396728000 is a `hidden beast` number, since 6 + 6 + 7 + 99 + 396 + 72 + 80 + 0 + 0 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66799396728000.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4936542 + ... + 12568541.

Almost surely, 2^{66799396728000} is an apocalyptic number.

66799396728000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66799396728000 is an abundant number, since it is smaller than the sum of its proper divisors (176661731666016).

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

66799396728000 is a wasteful number, since it uses less digits than its factorization.

66799396728000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17505169 (or 17505146 counting only the distinct ones).

The product of its (nonzero) digits is 370355328, while the sum is 72.

The spelling of 66799396728000 in words is "sixty-six trillion, seven hundred ninety-nine billion, three hundred ninety-six million, seven hundred twenty-eight thousand".