136640425 has 6 divisors (see below), whose sum is σ = 169434158. Its totient is φ = 109312320.

The previous prime is 136640393. The next prime is 136640429. The reversal of 136640425 is 524046631.

136640425 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 3 ways, for example, as 32171584 + 104468841 = 5672^2 + 10221^2 .

It is not a de Polignac number, because 136640425 - 2⁵ = 136640393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136640429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2732784 + ... + 2732833.

Almost surely, 2^136640425 is an apocalyptic number.

It is an amenable number.

136640425 is a deficient number, since it is larger than the sum of its proper divisors (32793733).

136640425 is an equidigital number, since it uses as much as digits as its factorization.

136640425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465627 (or 5465622 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 136640425 is about 11689.3295359486. The cubic root of 136640425 is about 515.0622666410.

The spelling of 136640425 in words is "one hundred thirty-six million, six hundred forty thousand, four hundred twenty-five".