66713165 has 8 divisors (see below), whose sum is σ = 80154360. Its totient is φ = 53304832.

The previous prime is 66713149. The next prime is 66713177. The reversal of 66713165 is 56131766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16104169 + 50608996 = 4013^2 + 7114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66713165 - 2⁴ = 66713149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500 + ... + 12069.

It is an arithmetic number, because the mean of its divisors is an integer number (10019295).

Almost surely, 2^66713165 is an apocalyptic number.

It is an amenable number.

66713165 is a deficient number, since it is larger than the sum of its proper divisors (13441195).

66713165 is a wasteful number, since it uses less digits than its factorization.

66713165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16431.

The product of its digits is 22680, while the sum is 35.

The square root of 66713165 is about 8167.8127427115. The cubic root of 66713165 is about 405.5743818815.

The spelling of 66713165 in words is "sixty-six million, seven hundred thirteen thousand, one hundred sixty-five".