66131165 has 16 divisors (see below), whose sum is σ = 82615680. Its totient is φ = 50756160.

The previous prime is 66131161. The next prime is 66131171. The reversal of 66131165 is 56113166.

It is not a de Polignac number, because 66131165 - 2² = 66131161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66131161) 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, 22850 + ... + 25580.

It is an arithmetic number, because the mean of its divisors is an integer number (5163480).

Almost surely, 2^66131165 is an apocalyptic number.

It is an amenable number.

66131165 is a deficient number, since it is larger than the sum of its proper divisors (16484515).

66131165 is a wasteful number, since it uses less digits than its factorization.

66131165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932.

The product of its digits is 3240, while the sum is 29.

The square root of 66131165 is about 8132.1070455325. The cubic root of 66131165 is about 404.3915366533.

The spelling of 66131165 in words is "sixty-six million, one hundred thirty-one thousand, one hundred sixty-five".