66666504 has 16 divisors (see below), whose sum is σ = 166666320. Its totient is φ = 22222160.

The previous prime is 66666493. The next prime is 66666517. The reversal of 66666504 is 40566666.

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, 1388862 + ... + 1388909.

It is an arithmetic number, because the mean of its divisors is an integer number (10416645).

Almost surely, 2^66666504 is an apocalyptic number.

It is an amenable number.

66666504 is an abundant number, since it is smaller than the sum of its proper divisors (99999816).

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

66666504 is a wasteful number, since it uses less digits than its factorization.

66666504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777780 (or 2777776 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 66666504 is about 8164.9558480129. The cubic root of 66666504 is about 405.4798032475.

The spelling of 66666504 in words is "sixty-six million, six hundred sixty-six thousand, five hundred four".