136686821039 has 4 divisors (see below), whose sum is σ = 137206543056. Its totient is φ = 136167099024.

The previous prime is 136686820999. The next prime is 136686821057. The reversal of 136686821039 is 930128686631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136686821039 - 2²⁰ = 136685772463 is a prime.

It is a super-2 number, since 2×136686821039² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136686821639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259860614 + ... + 259861139.

It is an arithmetic number, because the mean of its divisors is an integer number (34301635764).

Almost surely, 2^136686821039 is an apocalyptic number.

136686821039 is a deficient number, since it is larger than the sum of its proper divisors (519722017).

136686821039 is an equidigital number, since it uses as much as digits as its factorization.

136686821039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519722016.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 136686821039 in words is "one hundred thirty-six billion, six hundred eighty-six million, eight hundred twenty-one thousand, thirty-nine".