123256817713 has 2 divisors, whose sum is σ = 123256817714. Its totient is φ = 123256817712.

The previous prime is 123256817681. The next prime is 123256817729. The reversal of 123256817713 is 317718652321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120175235569 + 3081582144 = 346663^2 + 55512^2 .

It is a cyclic number.

It is not a de Polignac number, because 123256817713 - 2⁵ = 123256817681 is a prime.

It is a super-2 number, since 2×123256817713² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123256817743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61628408856 + 61628408857.

It is an arithmetic number, because the mean of its divisors is an integer number (61628408857).

Almost surely, 2^123256817713 is an apocalyptic number.

It is an amenable number.

123256817713 is a deficient number, since it is larger than the sum of its proper divisors (1).

123256817713 is an equidigital number, since it uses as much as digits as its factorization.

123256817713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The spelling of 123256817713 in words is "one hundred twenty-three billion, two hundred fifty-six million, eight hundred seventeen thousand, seven hundred thirteen".