123871718689 has 2 divisors, whose sum is σ = 123871718690. Its totient is φ = 123871718688.

The previous prime is 123871718569. The next prime is 123871718779. The reversal of 123871718689 is 986817178321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116512995600 + 7358723089 = 341340^2 + 85783^2 .

It is a cyclic number.

It is not a de Polignac number, because 123871718689 - 2¹¹ = 123871716641 is a prime.

It is not a weakly prime, because it can be changed into another prime (123871718389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61935859344 + 61935859345.

It is an arithmetic number, because the mean of its divisors is an integer number (61935859345).

Almost surely, 2^123871718689 is an apocalyptic number.

It is an amenable number.

123871718689 is a deficient number, since it is larger than the sum of its proper divisors (1).

123871718689 is an equidigital number, since it uses as much as digits as its factorization.

123871718689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 61.

The spelling of 123871718689 in words is "one hundred twenty-three billion, eight hundred seventy-one million, seven hundred eighteen thousand, six hundred eighty-nine".