66564659 has 8 divisors (see below), whose sum is σ = 76131840. Its totient is φ = 57011976.

The previous prime is 66564649. The next prime is 66564679. The reversal of 66564659 is 95646566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-66564659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66564629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9302 + ... + 14820.

It is an arithmetic number, because the mean of its divisors is an integer number (9516480).

Almost surely, 2^66564659 is an apocalyptic number.

66564659 is a deficient number, since it is larger than the sum of its proper divisors (9567181).

66564659 is a wasteful number, since it uses less digits than its factorization.

66564659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7249.

The product of its digits is 1166400, while the sum is 47.

The square root of 66564659 is about 8158.7167495875. The cubic root of 66564659 is about 405.2732170560.

The spelling of 66564659 in words is "sixty-six million, five hundred sixty-four thousand, six hundred fifty-nine".