66164565 has 32 divisors (see below), whose sum is σ = 108493056. Its totient is φ = 34421760.

The previous prime is 66164543. The next prime is 66164569. The reversal of 66164565 is 56546166.

It is not a de Polignac number, because 66164565 - 2⁷ = 66164437 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66164569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152589 + ... + 153021.

It is an arithmetic number, because the mean of its divisors is an integer number (3390408).

Almost surely, 2^66164565 is an apocalyptic number.

It is an amenable number.

66164565 is a deficient number, since it is larger than the sum of its proper divisors (42328491).

66164565 is a wasteful number, since it uses less digits than its factorization.

66164565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669.

The product of its digits is 129600, while the sum is 39.

The square root of 66164565 is about 8134.1603746177. The cubic root of 66164565 is about 404.4596054379.

The spelling of 66164565 in words is "sixty-six million, one hundred sixty-four thousand, five hundred sixty-five".