136215665 has 12 divisors (see below), whose sum is σ = 165044124. Its totient is φ = 107925696.

The previous prime is 136215659. The next prime is 136215689. The reversal of 136215665 is 566512631.

136215665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 73441 + 136142224 = 271^2 + 11668^2 .

It is not a de Polignac number, because 136215665 - 2²⁰ = 135167089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58259 + ... + 60551.

It is an arithmetic number, because the mean of its divisors is an integer number (13753677).

Almost surely, 2^136215665 is an apocalyptic number.

It is an amenable number.

136215665 is a deficient number, since it is larger than the sum of its proper divisors (28828459).

136215665 is an equidigital number, since it uses as much as digits as its factorization.

136215665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516 (or 2407 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 136215665 is about 11671.1466874511. The cubic root of 136215665 is about 514.5280056708.

The spelling of 136215665 in words is "one hundred thirty-six million, two hundred fifteen thousand, six hundred sixty-five".