136639663 has 4 divisors (see below), whose sum is σ = 138286008. Its totient is φ = 134993320.

The previous prime is 136639651. The next prime is 136639667. The reversal of 136639663 is 366936631.

136639663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366936631 = 3499 ⋅104869.

It is a cyclic number.

It is not a de Polignac number, because 136639663 - 2¹³ = 136631471 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 (136639667) 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, 823048 + ... + 823213.

It is an arithmetic number, because the mean of its divisors is an integer number (34571502).

Almost surely, 2^136639663 is an apocalyptic number.

136639663 is a deficient number, since it is larger than the sum of its proper divisors (1646345).

136639663 is an equidigital number, since it uses as much as digits as its factorization.

136639663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646344.

The product of its digits is 314928, while the sum is 43.

The square root of 136639663 is about 11689.2969420748. The cubic root of 136639663 is about 515.0613091933.

The spelling of 136639663 in words is "one hundred thirty-six million, six hundred thirty-nine thousand, six hundred sixty-three".