66439564 has 12 divisors (see below), whose sum is σ = 116403784. Its totient is φ = 33181344.

The previous prime is 66439559. The next prime is 66439579. The reversal of 66439564 is 46593466.

It is a self number, because there is not a number n which added to its sum of digits gives 66439564.

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, 5529 + ... + 12784.

Almost surely, 2^66439564 is an apocalyptic number.

It is an amenable number.

66439564 is a deficient number, since it is larger than the sum of its proper divisors (49964220).

66439564 is a wasteful number, since it uses less digits than its factorization.

66439564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19224 (or 19222 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 66439564 is about 8151.0468039387. The cubic root of 66439564 is about 405.0191811268.

The spelling of 66439564 in words is "sixty-six million, four hundred thirty-nine thousand, five hundred sixty-four".