123611622661 has 2 divisors, whose sum is σ = 123611622662. Its totient is φ = 123611622660.

The previous prime is 123611622637. The next prime is 123611622677. The reversal of 123611622661 is 166226116321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121160382561 + 2451240100 = 348081^2 + 49510^2 .

It is a cyclic number.

It is not a de Polignac number, because 123611622661 - 2²¹ = 123609525509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123611622661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123611628661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61805811330 + 61805811331.

It is an arithmetic number, because the mean of its divisors is an integer number (61805811331).

Almost surely, 2^123611622661 is an apocalyptic number.

It is an amenable number.

123611622661 is a deficient number, since it is larger than the sum of its proper divisors (1).

123611622661 is an equidigital number, since it uses as much as digits as its factorization.

123611622661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

Adding to 123611622661 its reverse (166226116321), we get a palindrome (289837738982).

The spelling of 123611622661 in words is "one hundred twenty-three billion, six hundred eleven million, six hundred twenty-two thousand, six hundred sixty-one".