136686820999 has 2 divisors, whose sum is σ = 136686821000. Its totient is φ = 136686820998.

The previous prime is 136686820979. The next prime is 136686821057. The reversal of 136686820999 is 999028686631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136686820999 - 2⁵ = 136686820967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136686820969) 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, 68343410499 + 68343410500.

It is an arithmetic number, because the mean of its divisors is an integer number (68343410500).

Almost surely, 2^136686820999 is an apocalyptic number.

136686820999 is a deficient number, since it is larger than the sum of its proper divisors (1).

136686820999 is an equidigital number, since it uses as much as digits as its factorization.

136686820999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60466176, while the sum is 67.

The spelling of 136686820999 in words is "one hundred thirty-six billion, six hundred eighty-six million, eight hundred twenty thousand, nine hundred ninety-nine".