66564001 has 12 divisors (see below), whose sum is σ = 80799552. Its totient is φ = 54573288.

The previous prime is 66563989. The next prime is 66564013. The reversal of 66564001 is 10046566.

It is an interprime number because it is at equal distance from previous prime (66563989) and next prime (66564013).

It is not a de Polignac number, because 66564001 - 2⁷ = 66563873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66564041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28405 + ... + 30658.

It is an arithmetic number, because the mean of its divisors is an integer number (6733296).

Almost surely, 2^66564001 is an apocalyptic number.

It is an amenable number.

66564001 is a deficient number, since it is larger than the sum of its proper divisors (14235551).

66564001 is a wasteful number, since it uses less digits than its factorization.

66564001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59100 (or 59093 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66564001 is about 8158.6764245189. The cubic root of 66564001 is about 405.2718816594.

The spelling of 66564001 in words is "sixty-six million, five hundred sixty-four thousand, one".