66753907138512 has 120 divisors (see below), whose sum is σ = 211349912635680. Its totient is φ = 20228456695680.

The previous prime is 66753907138439. The next prime is 66753907138531. The reversal of 66753907138512 is 21583170935766.

66753907138512 is a `hidden beast` number, since 6 + 6 + 7 + 539 + 0 + 7 + 1 + 3 + 85 + 12 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66753907138512.

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, 780376087 + ... + 780461622.

It is an arithmetic number, because the mean of its divisors is an integer number (1761249271964).

Almost surely, 2^{66753907138512} is an apocalyptic number.

It is an amenable number.

66753907138512 is an abundant number, since it is smaller than the sum of its proper divisors (144596005497168).

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

66753907138512 is a wasteful number, since it uses less digits than its factorization.

66753907138512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560837743 (or 1560837725 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 63.

The spelling of 66753907138512 in words is "sixty-six trillion, seven hundred fifty-three billion, nine hundred seven million, one hundred thirty-eight thousand, five hundred twelve".