66717267552 has 72 divisors (see below), whose sum is σ = 204321643344. Its totient is φ = 20528388864.

The previous prime is 66717267493. The next prime is 66717267581. The reversal of 66717267552 is 25576271766.

66717267552 is a `hidden beast` number, since 6 + 67 + 1 + 7 + 26 + 7 + 552 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8906148 + ... + 8913635.

It is an arithmetic number, because the mean of its divisors is an integer number (2837800602).

Almost surely, 2^66717267552 is an apocalyptic number.

It is an amenable number.

66717267552 is an abundant number, since it is smaller than the sum of its proper divisors (137604375792).

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

66717267552 is a wasteful number, since it uses less digits than its factorization.

66717267552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17819812 (or 17819801 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 54.

The spelling of 66717267552 in words is "sixty-six billion, seven hundred seventeen million, two hundred sixty-seven thousand, five hundred fifty-two".