136640025 has 72 divisors (see below), whose sum is σ = 259596480. Its totient is φ = 68584320.

The previous prime is 136640017. The next prime is 136640057. The reversal of 136640025 is 520046631.

136640025 is a `hidden beast` number, since 13 + 6 + 640 + 0 + 2 + 5 = 666.

It is not a de Polignac number, because 136640025 - 2³ = 136640017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 280332 + ... + 280818.

Almost surely, 2^136640025 is an apocalyptic number.

136640025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

136640025 is a deficient number, since it is larger than the sum of its proper divisors (122956455).

136640025 is a wasteful number, since it uses less digits than its factorization.

136640025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 136640025 is about 11689.3124263149. The cubic root of 136640025 is about 515.0617640442.

Adding to 136640025 its reverse (520046631), we get a palindrome (656686656).

The spelling of 136640025 in words is "one hundred thirty-six million, six hundred forty thousand, twenty-five".