136631878685 has 8 divisors (see below), whose sum is σ = 163987729080. Its totient is φ = 109285853184.

The previous prime is 136631878673. The next prime is 136631878711. The reversal of 136631878685 is 586878136631.

It can be written as a sum of positive squares in 4 ways, for example, as 18973960516 + 117657918169 = 137746^2 + 343013^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136631878685 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2425592 + ... + 2481281.

It is an arithmetic number, because the mean of its divisors is an integer number (20498466135).

Almost surely, 2^136631878685 is an apocalyptic number.

It is an amenable number.

136631878685 is a deficient number, since it is larger than the sum of its proper divisors (27355850395).

136631878685 is an equidigital number, since it uses as much as digits as its factorization.

136631878685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4912447.

The product of its digits is 34836480, while the sum is 62.

The spelling of 136631878685 in words is "one hundred thirty-six billion, six hundred thirty-one million, eight hundred seventy-eight thousand, six hundred eighty-five".