66909165 has 16 divisors (see below), whose sum is σ = 112689600. Its totient is φ = 33806592.

The previous prime is 66909163. The next prime is 66909169. The reversal of 66909165 is 56190966.

It is not a de Polignac number, because 66909165 - 2¹ = 66909163 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66909163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117100 + ... + 117669.

It is an arithmetic number, because the mean of its divisors is an integer number (7043100).

Almost surely, 2^66909165 is an apocalyptic number.

It is an amenable number.

66909165 is a deficient number, since it is larger than the sum of its proper divisors (45780435).

66909165 is a wasteful number, since it uses less digits than its factorization.

66909165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234796.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 66909165 is about 8179.8022592236. The cubic root of 66909165 is about 405.9711794113.

The spelling of 66909165 in words is "sixty-six million, nine hundred nine thousand, one hundred sixty-five".