123757281390689 has 2 divisors, whose sum is σ = 123757281390690. Its totient is φ = 123757281390688.

The previous prime is 123757281390593. The next prime is 123757281390707. The reversal of 123757281390689 is 986093182757321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123757281390625 + 64 = 11124625^2 + 8^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123757281390689 is a prime.

It is not a weakly prime, because it can be changed into another prime (123757281390389) 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, 61878640695344 + 61878640695345.

It is an arithmetic number, because the mean of its divisors is an integer number (61878640695345).

Almost surely, 2^{123757281390689} is an apocalyptic number.

It is an amenable number.

123757281390689 is a deficient number, since it is larger than the sum of its proper divisors (1).

123757281390689 is an equidigital number, since it uses as much as digits as its factorization.

123757281390689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 274337280, while the sum is 71.

The spelling of 123757281390689 in words is "one hundred twenty-three trillion, seven hundred fifty-seven billion, two hundred eighty-one million, three hundred ninety thousand, six hundred eighty-nine".