66221862799 has 2 divisors, whose sum is σ = 66221862800. Its totient is φ = 66221862798.

The previous prime is 66221862779. The next prime is 66221862809. The reversal of 66221862799 is 99726812266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66221862799 - 2³¹ = 64074379151 is a prime.

It is a super-2 number, since 2×66221862799² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66221862709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33110931399 + 33110931400.

It is an arithmetic number, because the mean of its divisors is an integer number (33110931400).

Almost surely, 2^66221862799 is an apocalyptic number.

66221862799 is a deficient number, since it is larger than the sum of its proper divisors (1).

66221862799 is an equidigital number, since it uses as much as digits as its factorization.

66221862799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 58.

The spelling of 66221862799 in words is "sixty-six billion, two hundred twenty-one million, eight hundred sixty-two thousand, seven hundred ninety-nine".