25917278459 has 2 divisors, whose sum is σ = 25917278460. Its totient is φ = 25917278458.

The previous prime is 25917278449. The next prime is 25917278483. The reversal of 25917278459 is 95487271952.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25917278459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25917278398 and 25917278407.

It is not a weakly prime, because it can be changed into another prime (25917278419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12958639229 + 12958639230.

It is an arithmetic number, because the mean of its divisors is an integer number (12958639230).

Almost surely, 2^25917278459 is an apocalyptic number.

25917278459 is a deficient number, since it is larger than the sum of its proper divisors (1).

25917278459 is an equidigital number, since it uses as much as digits as its factorization.

25917278459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12700800, while the sum is 59.

The spelling of 25917278459 in words is "twenty-five billion, nine hundred seventeen million, two hundred seventy-eight thousand, four hundred fifty-nine".