66140523684 has 27 divisors (see below), whose sum is σ = 167192446603. Its totient is φ = 22046326872.

The previous prime is 66140523679. The next prime is 66140523707. The reversal of 66140523684 is 48632504166.

The square root of 66140523684 is 257178.

It is a perfect power (a square), and thus also a powerful number.

66140523684 is a `hidden beast` number, since 6 + 6 + 1 + 40 + 523 + 6 + 84 = 666.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1521637 + ... + 1564499.

Almost surely, 2^66140523684 is an apocalyptic number.

66140523684 is the 257178-th square number.

It is an amenable number.

66140523684 is an abundant number, since it is smaller than the sum of its proper divisors (101051922919).

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

66140523684 is an frugal number, since it uses more digits than its factorization.

66140523684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85736 (or 42868 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

It can be divided in two parts, 66140 and 523684, that added together give a square (589824 = 768²).

The spelling of 66140523684 in words is "sixty-six billion, one hundred forty million, five hundred twenty-three thousand, six hundred eighty-four".