66221752687 has 2 divisors, whose sum is σ = 66221752688. Its totient is φ = 66221752686.

The previous prime is 66221752661. The next prime is 66221752691. The reversal of 66221752687 is 78625712266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66221752687 - 2¹⁵ = 66221719919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66221752627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33110876343 + 33110876344.

It is an arithmetic number, because the mean of its divisors is an integer number (33110876344).

Almost surely, 2^66221752687 is an apocalyptic number.

66221752687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66221752687 is an equidigital number, since it uses as much as digits as its factorization.

66221752687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 52.

The spelling of 66221752687 in words is "sixty-six billion, two hundred twenty-one million, seven hundred fifty-two thousand, six hundred eighty-seven".