66325664 has 24 divisors (see below), whose sum is σ = 130804128. Its totient is φ = 33105600.

The previous prime is 66325663. The next prime is 66325669. The reversal of 66325664 is 46652366.

It is not an unprimeable number, because it can be changed into a prime (66325661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21839 + ... + 24689.

It is an arithmetic number, because the mean of its divisors is an integer number (5450172).

Almost surely, 2^66325664 is an apocalyptic number.

It is an amenable number.

66325664 is a deficient number, since it is larger than the sum of its proper divisors (64478464).

66325664 is a wasteful number, since it uses less digits than its factorization.

66325664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588 (or 3580 counting only the distinct ones).

The product of its digits is 155520, while the sum is 38.

The square root of 66325664 is about 8144.0569742604. The cubic root of 66325664 is about 404.7876018845.

The spelling of 66325664 in words is "sixty-six million, three hundred twenty-five thousand, six hundred sixty-four".