123422657665 has 4 divisors (see below), whose sum is σ = 148107189204. Its totient is φ = 98738126128.

The previous prime is 123422657651. The next prime is 123422657681. The reversal of 123422657665 is 566756224321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566756224321 = 7 ⋅80965174903.

It can be written as a sum of positive squares in 2 ways, for example, as 45655296241 + 77767361424 = 213671^2 + 278868^2 .

It is a cyclic number.

It is not a de Polignac number, because 123422657665 - 2⁹ = 123422657153 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12342265762 + ... + 12342265771.

It is an arithmetic number, because the mean of its divisors is an integer number (37026797301).

Almost surely, 2^123422657665 is an apocalyptic number.

It is an amenable number.

123422657665 is a deficient number, since it is larger than the sum of its proper divisors (24684531539).

123422657665 is an equidigital number, since it uses as much as digits as its factorization.

123422657665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24684531538.

The product of its digits is 3628800, while the sum is 49.

The spelling of 123422657665 in words is "one hundred twenty-three billion, four hundred twenty-two million, six hundred fifty-seven thousand, six hundred sixty-five".