66511500531272 has 32 divisors (see below), whose sum is σ = 127664971758720. Its totient is φ = 32470869439680.

The previous prime is 66511500531127. The next prime is 66511500531349. The reversal of 66511500531272 is 27213500511566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209927558 + ... + 210244149.

It is an arithmetic number, because the mean of its divisors is an integer number (3989530367460).

Almost surely, 2^{66511500531272} is an apocalyptic number.

It is an amenable number.

66511500531272 is a deficient number, since it is larger than the sum of its proper divisors (61153471227448).

66511500531272 is a wasteful number, since it uses less digits than its factorization.

66511500531272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420172181 (or 420172177 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 66511500531272 in words is "sixty-six trillion, five hundred eleven billion, five hundred million, five hundred thirty-one thousand, two hundred seventy-two".