66317871365 has 16 divisors (see below), whose sum is σ = 80518320000. Its totient is φ = 52433295552.

The previous prime is 66317871349. The next prime is 66317871407. The reversal of 66317871365 is 56317871366.

66317871365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66317871365 - 2⁴ = 66317871349 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 15 ways as a sum of consecutive naturals, for example, 75407 + ... + 371916.

It is an arithmetic number, because the mean of its divisors is an integer number (5032395000).

Almost surely, 2^66317871365 is an apocalyptic number.

It is an amenable number.

66317871365 is a deficient number, since it is larger than the sum of its proper divisors (14200448635).

66317871365 is a wasteful number, since it uses less digits than its factorization.

66317871365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447676.

The product of its digits is 3810240, while the sum is 53.

Subtracting from 66317871365 its reverse (56317871366), we obtain a palindrome (9999999999).

The spelling of 66317871365 in words is "sixty-six billion, three hundred seventeen million, eight hundred seventy-one thousand, three hundred sixty-five".