123358013561 has 2 divisors, whose sum is σ = 123358013562. Its totient is φ = 123358013560.

The previous prime is 123358013557. The next prime is 123358013587. The reversal of 123358013561 is 165310853321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68189399161 + 55168614400 = 261131^2 + 234880^2 .

It is a cyclic number.

It is not a de Polignac number, because 123358013561 - 2² = 123358013557 is a prime.

It is not a weakly prime, because it can be changed into another prime (123358013161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61679006780 + 61679006781.

It is an arithmetic number, because the mean of its divisors is an integer number (61679006781).

Almost surely, 2^123358013561 is an apocalyptic number.

It is an amenable number.

123358013561 is a deficient number, since it is larger than the sum of its proper divisors (1).

123358013561 is an equidigital number, since it uses as much as digits as its factorization.

123358013561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 123358013561 its reverse (165310853321), we get a palindrome (288668866882).

The spelling of 123358013561 in words is "one hundred twenty-three billion, three hundred fifty-eight million, thirteen thousand, five hundred sixty-one".