66580238136 has 16 divisors (see below), whose sum is σ = 166450595400. Its totient is φ = 22193412704.

The previous prime is 66580238129. The next prime is 66580238171. The reversal of 66580238136 is 63183208566.

It is a super-2 number, since 2×66580238136² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 1387088271 + ... + 1387088318.

Almost surely, 2^66580238136 is an apocalyptic number.

It is an amenable number.

66580238136 is an abundant number, since it is smaller than the sum of its proper divisors (99870357264).

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

66580238136 is a wasteful number, since it uses less digits than its factorization.

66580238136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774176598 (or 2774176594 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 66580238136 in words is "sixty-six billion, five hundred eighty million, two hundred thirty-eight thousand, one hundred thirty-six".