25673865217 has 32 divisors (see below), whose sum is σ = 35174764800. Its totient is φ = 18466680960.

The previous prime is 25673865209. The next prime is 25673865229. The reversal of 25673865217 is 71256837652.

It is a happy number.

It is not a de Polignac number, because 25673865217 - 2³ = 25673865209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25673865247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212668 + ... + 310765.

It is an arithmetic number, because the mean of its divisors is an integer number (1099211400).

Almost surely, 2^25673865217 is an apocalyptic number.

It is an amenable number.

25673865217 is a deficient number, since it is larger than the sum of its proper divisors (9500899583).

25673865217 is a wasteful number, since it uses less digits than its factorization.

25673865217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523478 (or 523464 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 52.

The spelling of 25673865217 in words is "twenty-five billion, six hundred seventy-three million, eight hundred sixty-five thousand, two hundred seventeen".