66187697792 has 32 divisors (see below), whose sum is σ = 132434163300. Its totient is φ = 32949319680.

The previous prime is 66187697777. The next prime is 66187697809. The reversal of 66187697792 is 29779678166.

It can be written as a sum of positive squares in 2 ways, for example, as 65975004736 + 212693056 = 256856^2 + 14584^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×66187697792² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099709 + ... + 1158332.

Almost surely, 2^66187697792 is an apocalyptic number.

It is an amenable number.

66187697792 is an abundant number, since it is smaller than the sum of its proper divisors (66246465508).

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

66187697792 is a wasteful number, since it uses less digits than its factorization.

66187697792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258284 (or 2258272 counting only the distinct ones).

The product of its digits is 96018048, while the sum is 68.

The spelling of 66187697792 in words is "sixty-six billion, one hundred eighty-seven million, six hundred ninety-seven thousand, seven hundred ninety-two".