66656604 has 48 divisors (see below), whose sum is σ = 178214400. Its totient is φ = 18995136.

The previous prime is 66656593. The next prime is 66656651. The reversal of 66656604 is 40665666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41977 + ... + 43535.

It is an arithmetic number, because the mean of its divisors is an integer number (3712800).

Almost surely, 2^66656604 is an apocalyptic number.

It is an amenable number.

66656604 is an abundant number, since it is smaller than the sum of its proper divisors (111557796).

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

66656604 is a wasteful number, since it uses less digits than its factorization.

66656604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082 (or 2080 counting only the distinct ones).

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

The square root of 66656604 is about 8164.3495760532. The cubic root of 66656604 is about 405.4597309546.

The spelling of 66656604 in words is "sixty-six million, six hundred fifty-six thousand, six hundred four".