25640974017 has 12 divisors (see below), whose sum is σ = 37039282020. Its totient is φ = 17092912128.

The previous prime is 25640974001. The next prime is 25640974019. The reversal of 25640974017 is 71047904652.

25640974017 is a `hidden beast` number, since 2 + 564 + 0 + 9 + 74 + 0 + 17 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16021483776 + 9619490241 = 126576^2 + 98079^2 .

It is not a de Polignac number, because 25640974017 - 2⁴ = 25640974001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25640974019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79213 + ... + 239909.

It is an arithmetic number, because the mean of its divisors is an integer number (3086606835).

Almost surely, 2^25640974017 is an apocalyptic number.

It is an amenable number.

25640974017 is a deficient number, since it is larger than the sum of its proper divisors (11398308003).

25640974017 is a wasteful number, since it uses less digits than its factorization.

25640974017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178432 (or 178429 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 25640974017 in words is "twenty-five billion, six hundred forty million, nine hundred seventy-four thousand, seventeen".