136718653 has 4 divisors (see below), whose sum is σ = 136742140. Its totient is φ = 136695168.

The previous prime is 136718639. The next prime is 136718669. The reversal of 136718653 is 356817631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 356817631 = 12211 ⋅29221.

It can be written as a sum of positive squares in 2 ways, for example, as 51581124 + 85137529 = 7182^2 + 9227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136718653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136718633) 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, 4243 + ... + 17071.

It is an arithmetic number, because the mean of its divisors is an integer number (34185535).

Almost surely, 2^136718653 is an apocalyptic number.

It is an amenable number.

136718653 is a deficient number, since it is larger than the sum of its proper divisors (23487).

136718653 is a wasteful number, since it uses less digits than its factorization.

136718653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23486.

The product of its digits is 90720, while the sum is 40.

The square root of 136718653 is about 11692.6751857734. The cubic root of 136718653 is about 515.1605406430.

The spelling of 136718653 in words is "one hundred thirty-six million, seven hundred eighteen thousand, six hundred fifty-three".