25917278463 has 24 divisors (see below), whose sum is σ = 38373032880. Its totient is φ = 16846266240.

The previous prime is 25917278459. The next prime is 25917278483. The reversal of 25917278463 is 36487271952.

It is a happy number.

25917278463 is a `hidden beast` number, since 2 + 5 + 9 + 172 + 7 + 8 + 463 = 666.

It is not a de Polignac number, because 25917278463 - 2² = 25917278459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25917278483) 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 23 ways as a sum of consecutive naturals, for example, 594820 + ... + 636902.

It is an arithmetic number, because the mean of its divisors is an integer number (1598876370).

Almost surely, 2^25917278463 is an apocalyptic number.

25917278463 is a deficient number, since it is larger than the sum of its proper divisors (12455754417).

25917278463 is a wasteful number, since it uses less digits than its factorization.

25917278463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43799 (or 43796 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 25917278463 in words is "twenty-five billion, nine hundred seventeen million, two hundred seventy-eight thousand, four hundred sixty-three".