66164265 has 24 divisors (see below), whose sum is σ = 114978240. Its totient is φ = 35197344.

The previous prime is 66164257. The next prime is 66164269. The reversal of 66164265 is 56246166.

It is a happy number.

66164265 is a `hidden beast` number, since 6 + 6 + 1 + 642 + 6 + 5 = 666.

It is not a de Polignac number, because 66164265 - 2³ = 66164257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66164269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18276 + ... + 21594.

It is an arithmetic number, because the mean of its divisors is an integer number (4790760).

Almost surely, 2^66164265 is an apocalyptic number.

It is an amenable number.

66164265 is a deficient number, since it is larger than the sum of its proper divisors (48813975).

66164265 is a wasteful number, since it uses less digits than its factorization.

66164265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3773 (or 3770 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66164265 is about 8134.1419338490. The cubic root of 66164265 is about 404.4589941436.

The spelling of 66164265 in words is "sixty-six million, one hundred sixty-four thousand, two hundred sixty-five".