66316565 has 16 divisors (see below), whose sum is σ = 91125120. Its totient is φ = 45385920.

The previous prime is 66316561. The next prime is 66316573. The reversal of 66316565 is 56561366.

It is not a de Polignac number, because 66316565 - 2² = 66316561 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66316561) 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, 20135 + ... + 23195.

It is an arithmetic number, because the mean of its divisors is an integer number (5695320).

Almost surely, 2^66316565 is an apocalyptic number.

It is an amenable number.

66316565 is a deficient number, since it is larger than the sum of its proper divisors (24808555).

66316565 is a wasteful number, since it uses less digits than its factorization.

66316565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692.

The product of its digits is 97200, while the sum is 38.

The square root of 66316565 is about 8143.4983268863. The cubic root of 66316565 is about 404.7690905441.

The spelling of 66316565 in words is "sixty-six million, three hundred sixteen thousand, five hundred sixty-five".