136503187817 has 2 divisors, whose sum is σ = 136503187818. Its totient is φ = 136503187816.

The previous prime is 136503187813. The next prime is 136503187819. The reversal of 136503187817 is 718781305631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100419905881 + 36083281936 = 316891^2 + 189956^2 .

It is a cyclic number.

It is not a de Polignac number, because 136503187817 - 2² = 136503187813 is a prime.

Together with 136503187819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136503187813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68251593908 + 68251593909.

It is an arithmetic number, because the mean of its divisors is an integer number (68251593909).

Almost surely, 2^136503187817 is an apocalyptic number.

It is an amenable number.

136503187817 is a deficient number, since it is larger than the sum of its proper divisors (1).

136503187817 is an equidigital number, since it uses as much as digits as its factorization.

136503187817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 136503187817 in words is "one hundred thirty-six billion, five hundred three million, one hundred eighty-seven thousand, eight hundred seventeen".