123665139229 has 2 divisors, whose sum is σ = 123665139230. Its totient is φ = 123665139228.

The previous prime is 123665139197. The next prime is 123665139239. The reversal of 123665139229 is 922931566321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83134188900 + 40530950329 = 288330^2 + 201323^2 .

It is a cyclic number.

It is not a de Polignac number, because 123665139229 - 2⁵ = 123665139197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123665139239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61832569614 + 61832569615.

It is an arithmetic number, because the mean of its divisors is an integer number (61832569615).

Almost surely, 2^123665139229 is an apocalyptic number.

It is an amenable number.

123665139229 is a deficient number, since it is larger than the sum of its proper divisors (1).

123665139229 is an equidigital number, since it uses as much as digits as its factorization.

123665139229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 49.

The spelling of 123665139229 in words is "one hundred twenty-three billion, six hundred sixty-five million, one hundred thirty-nine thousand, two hundred twenty-nine".