136344131685 has 80 divisors (see below), whose sum is σ = 247970986032. Its totient is φ = 71663616000.

The previous prime is 136344131681. The next prime is 136344131699. The reversal of 136344131685 is 586131443631.

136344131685 is a `hidden beast` number, since 1 + 3 + 634 + 4 + 1 + 3 + 1 + 6 + 8 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 22668614721 + 113675516964 = 150561^2 + 337158^2 .

It is not a de Polignac number, because 136344131685 - 2² = 136344131681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 136344131685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136344131681) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9460485 + ... + 9474885.

Almost surely, 2^136344131685 is an apocalyptic number.

136344131685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

136344131685 is a deficient number, since it is larger than the sum of its proper divisors (111626854347).

136344131685 is a wasteful number, since it uses less digits than its factorization.

136344131685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14756 (or 14747 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 136344131685 in words is "one hundred thirty-six billion, three hundred forty-four million, one hundred thirty-one thousand, six hundred eighty-five".