123599336557 has 2 divisors, whose sum is σ = 123599336558. Its totient is φ = 123599336556.

The previous prime is 123599336521. The next prime is 123599336561. The reversal of 123599336557 is 755633995321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70487064036 + 53112272521 = 265494^2 + 230461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123599336557 is a prime.

It is a super-2 number, since 2×123599336557² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123599339557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61799668278 + 61799668279.

It is an arithmetic number, because the mean of its divisors is an integer number (61799668279).

Almost surely, 2^123599336557 is an apocalyptic number.

It is an amenable number.

123599336557 is a deficient number, since it is larger than the sum of its proper divisors (1).

123599336557 is an equidigital number, since it uses as much as digits as its factorization.

123599336557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22963500, while the sum is 58.

The spelling of 123599336557 in words is "one hundred twenty-three billion, five hundred ninety-nine million, three hundred thirty-six thousand, five hundred fifty-seven".