136656823 has 4 divisors (see below), whose sum is σ = 142598448. Its totient is φ = 130715200.

The previous prime is 136656791. The next prime is 136656827. The reversal of 136656823 is 328656631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328656631 = 17 ⋅19332743.

It is a cyclic number.

It is not a de Polignac number, because 136656823 - 2⁵ = 136656791 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 (136656827) 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, 2970778 + ... + 2970823.

It is an arithmetic number, because the mean of its divisors is an integer number (35649612).

Almost surely, 2^136656823 is an apocalyptic number.

136656823 is a deficient number, since it is larger than the sum of its proper divisors (5941625).

136656823 is an equidigital number, since it uses as much as digits as its factorization.

136656823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5941624.

The product of its digits is 155520, while the sum is 40.

The square root of 136656823 is about 11690.0309238257. The cubic root of 136656823 is about 515.0828697512.

The spelling of 136656823 in words is "one hundred thirty-six million, six hundred fifty-six thousand, eight hundred twenty-three".