136681739681 has 2 divisors, whose sum is σ = 136681739682. Its totient is φ = 136681739680.

The previous prime is 136681739669. The next prime is 136681739699. The reversal of 136681739681 is 186937186631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114528096400 + 22153643281 = 338420^2 + 148841^2 .

It is a cyclic number.

It is not a de Polignac number, because 136681739681 - 2²² = 136677545377 is a prime.

It is a super-2 number, since 2×136681739681² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136681739681.

It is not a weakly prime, because it can be changed into another prime (136681735681) 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, 68340869840 + 68340869841.

It is an arithmetic number, because the mean of its divisors is an integer number (68340869841).

Almost surely, 2^136681739681 is an apocalyptic number.

It is an amenable number.

136681739681 is a deficient number, since it is larger than the sum of its proper divisors (1).

136681739681 is an equidigital number, since it uses as much as digits as its factorization.

136681739681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 59.

The spelling of 136681739681 in words is "one hundred thirty-six billion, six hundred eighty-one million, seven hundred thirty-nine thousand, six hundred eighty-one".