136138587817 has 2 divisors, whose sum is σ = 136138587818. Its totient is φ = 136138587816.

The previous prime is 136138587799. The next prime is 136138587821. The reversal of 136138587817 is 718785831631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133743072681 + 2395515136 = 365709^2 + 48944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136138587817 is a prime.

It is not a weakly prime, because it can be changed into another prime (136138587877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68069293908 + 68069293909.

It is an arithmetic number, because the mean of its divisors is an integer number (68069293909).

Almost surely, 2^136138587817 is an apocalyptic number.

It is an amenable number.

136138587817 is a deficient number, since it is larger than the sum of its proper divisors (1).

136138587817 is an equidigital number, since it uses as much as digits as its factorization.

136138587817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 58.

The spelling of 136138587817 in words is "one hundred thirty-six billion, one hundred thirty-eight million, five hundred eighty-seven thousand, eight hundred seventeen".