66806624 has 24 divisors (see below), whose sum is σ = 132809040. Its totient is φ = 33077376.

The previous prime is 66806611. The next prime is 66806629. The reversal of 66806624 is 42660866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66806629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6839 + ... + 13430.

It is an arithmetic number, because the mean of its divisors is an integer number (5533710).

Almost surely, 2^66806624 is an apocalyptic number.

It is an amenable number.

66806624 is a deficient number, since it is larger than the sum of its proper divisors (66002416).

66806624 is a wasteful number, since it uses less digits than its factorization.

66806624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20382 (or 20374 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 66806624 is about 8173.5319171090. The cubic root of 66806624 is about 405.7636842960.

The spelling of 66806624 in words is "sixty-six million, eight hundred six thousand, six hundred twenty-four".