66578056 has 8 divisors (see below), whose sum is σ = 124833870. Its totient is φ = 33289024.

The previous prime is 66578053. The next prime is 66578063. The reversal of 66578056 is 65087566.

It can be written as a sum of positive squares in only one way, i.e., 54257956 + 12320100 = 7366^2 + 3510^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (66578053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4161121 + ... + 4161136.

Almost surely, 2^66578056 is an apocalyptic number.

It is an amenable number.

66578056 is a deficient number, since it is larger than the sum of its proper divisors (58255814).

66578056 is a wasteful number, since it uses less digits than its factorization.

66578056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322263 (or 8322259 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 66578056 is about 8159.5377320042. The cubic root of 66578056 is about 405.3004040606.

The spelling of 66578056 in words is "sixty-six million, five hundred seventy-eight thousand, fifty-six".