136402806839909 has 2 divisors, whose sum is σ = 136402806839910. Its totient is φ = 136402806839908.

The previous prime is 136402806839773. The next prime is 136402806840043. The reversal of 136402806839909 is 909938608204631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136163927344900 + 238879495009 = 11668930^2 + 488753^2 .

It is an emirp because it is prime and its reverse (909938608204631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136402806839909 - 2⁸ = 136402806839653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136402806839309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68201403419954 + 68201403419955.

It is an arithmetic number, because the mean of its divisors is an integer number (68201403419955).

Almost surely, 2^{136402806839909} is an apocalyptic number.

It is an amenable number.

136402806839909 is a deficient number, since it is larger than the sum of its proper divisors (1).

136402806839909 is an equidigital number, since it uses as much as digits as its factorization.

136402806839909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120932352, while the sum is 68.

The spelling of 136402806839909 in words is "one hundred thirty-six trillion, four hundred two billion, eight hundred six million, eight hundred thirty-nine thousand, nine hundred nine".