123255192661 has 2 divisors, whose sum is σ = 123255192662. Its totient is φ = 123255192660.

The previous prime is 123255192589. The next prime is 123255192677. The reversal of 123255192661 is 166291552321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114163570161 + 9091622500 = 337881^2 + 95350^2 .

It is an emirp because it is prime and its reverse (166291552321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123255192661 - 2¹³ = 123255184469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123255192691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61627596330 + 61627596331.

It is an arithmetic number, because the mean of its divisors is an integer number (61627596331).

Almost surely, 2^123255192661 is an apocalyptic number.

It is an amenable number.

123255192661 is a deficient number, since it is larger than the sum of its proper divisors (1).

123255192661 is an equidigital number, since it uses as much as digits as its factorization.

123255192661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 43.

The spelling of 123255192661 in words is "one hundred twenty-three billion, two hundred fifty-five million, one hundred ninety-two thousand, six hundred sixty-one".