136686385481 has 2 divisors, whose sum is σ = 136686385482. Its totient is φ = 136686385480.

The previous prime is 136686385477. The next prime is 136686385573. The reversal of 136686385481 is 184583686631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135173875600 + 1512509881 = 367660^2 + 38891^2 .

It is a cyclic number.

It is not a de Polignac number, because 136686385481 - 2² = 136686385477 is a prime.

It is a super-2 number, since 2×136686385481² (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 136686385481.

It is not a weakly prime, because it can be changed into another prime (136686885481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68343192740 + 68343192741.

It is an arithmetic number, because the mean of its divisors is an integer number (68343192741).

Almost surely, 2^136686385481 is an apocalyptic number.

It is an amenable number.

136686385481 is a deficient number, since it is larger than the sum of its proper divisors (1).

136686385481 is an equidigital number, since it uses as much as digits as its factorization.

136686385481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19906560, while the sum is 59.

The spelling of 136686385481 in words is "one hundred thirty-six billion, six hundred eighty-six million, three hundred eighty-five thousand, four hundred eighty-one".