25898398917 has 4 divisors (see below), whose sum is σ = 34531198560. Its totient is φ = 17265599276.

The previous prime is 25898398853. The next prime is 25898398979. The reversal of 25898398917 is 71989389852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25898398917 - 2⁶ = 25898398853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25898398117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4316399817 + ... + 4316399822.

It is an arithmetic number, because the mean of its divisors is an integer number (8632799640).

Almost surely, 2^25898398917 is an apocalyptic number.

It is an amenable number.

25898398917 is a deficient number, since it is larger than the sum of its proper divisors (8632799643).

25898398917 is an equidigital number, since it uses as much as digits as its factorization.

25898398917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8632799642.

The product of its digits is 78382080, while the sum is 69.

The spelling of 25898398917 in words is "twenty-five billion, eight hundred ninety-eight million, three hundred ninety-eight thousand, nine hundred seventeen".