25317917478 has 24 divisors (see below), whose sum is σ = 62691986448. Its totient is φ = 7233690672.

The previous prime is 25317917459. The next prime is 25317917479. The reversal of 25317917478 is 87471971352.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25317917479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100467801 + ... + 100468052.

It is an arithmetic number, because the mean of its divisors is an integer number (2612166102).

Almost surely, 2^25317917478 is an apocalyptic number.

25317917478 is an abundant number, since it is smaller than the sum of its proper divisors (37374068970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25317917478 is a wasteful number, since it uses less digits than its factorization.

25317917478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200935868 (or 200935865 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 54.

The spelling of 25317917478 in words is "twenty-five billion, three hundred seventeen million, nine hundred seventeen thousand, four hundred seventy-eight".