66221107123 has 2 divisors, whose sum is σ = 66221107124. Its totient is φ = 66221107122.

The previous prime is 66221107109. The next prime is 66221107171. The reversal of 66221107123 is 32170112266.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66221107123 is a prime.

It is not a weakly prime, because it can be changed into another prime (66221107193) 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, 33110553561 + 33110553562.

It is an arithmetic number, because the mean of its divisors is an integer number (33110553562).

Almost surely, 2^66221107123 is an apocalyptic number.

66221107123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66221107123 is an equidigital number, since it uses as much as digits as its factorization.

66221107123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

Adding to 66221107123 its reverse (32170112266), we get a palindrome (98391219389).

The spelling of 66221107123 in words is "sixty-six billion, two hundred twenty-one million, one hundred seven thousand, one hundred twenty-three".