66564675 has 18 divisors (see below), whose sum is σ = 119225132. Its totient is φ = 35501040.

The previous prime is 66564649. The next prime is 66564679. The reversal of 66564675 is 57646566.

It is not a de Polignac number, because 66564675 - 2¹² = 66560579 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66564675.

It is not an unprimeable number, because it can be changed into a prime (66564679) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 147697 + ... + 148146.

Almost surely, 2^66564675 is an apocalyptic number.

66564675 is a deficient number, since it is larger than the sum of its proper divisors (52660457).

66564675 is a wasteful number, since it uses less digits than its factorization.

66564675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295859 (or 295851 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 66564675 is about 8158.7177301338. The cubic root of 66564675 is about 405.2732495275.

The spelling of 66564675 in words is "sixty-six million, five hundred sixty-four thousand, six hundred seventy-five".