66713172354 has 12 divisors (see below), whose sum is σ = 144545206806. Its totient is φ = 22237724112.

The previous prime is 66713172347. The next prime is 66713172371. The reversal of 66713172354 is 45327131766.

66713172354 is a `hidden beast` number, since 66 + 71 + 3 + 172 + 354 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52589038329 + 14124134025 = 229323^2 + 118845^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1853143659 + ... + 1853143694.

Almost surely, 2^66713172354 is an apocalyptic number.

66713172354 is an abundant number, since it is smaller than the sum of its proper divisors (77832034452).

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

66713172354 is a wasteful number, since it uses less digits than its factorization.

66713172354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706287361 (or 3706287358 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The spelling of 66713172354 in words is "sixty-six billion, seven hundred thirteen million, one hundred seventy-two thousand, three hundred fifty-four".