123564161117 has 2 divisors, whose sum is σ = 123564161118. Its totient is φ = 123564161116.

The previous prime is 123564161099. The next prime is 123564161141. The reversal of 123564161117 is 711161465321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69878807716 + 53685353401 = 264346^2 + 231701^2 .

It is a cyclic number.

It is not a de Polignac number, because 123564161117 - 2⁶ = 123564161053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123569161117) 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, 61782080558 + 61782080559.

It is an arithmetic number, because the mean of its divisors is an integer number (61782080559).

Almost surely, 2^123564161117 is an apocalyptic number.

It is an amenable number.

123564161117 is a deficient number, since it is larger than the sum of its proper divisors (1).

123564161117 is an equidigital number, since it uses as much as digits as its factorization.

123564161117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The spelling of 123564161117 in words is "one hundred twenty-three billion, five hundred sixty-four million, one hundred sixty-one thousand, one hundred seventeen".