25421809917 has 8 divisors (see below), whose sum is σ = 38737996096. Its totient is φ = 14526748512.

The previous prime is 25421809913. The next prime is 25421809921. The reversal of 25421809917 is 71990812452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25421809913) and next prime (25421809921).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25421809917 - 2² = 25421809913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421809913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605281168 + ... + 605281209.

It is an arithmetic number, because the mean of its divisors is an integer number (4842249512).

Almost surely, 2^25421809917 is an apocalyptic number.

It is an amenable number.

25421809917 is a deficient number, since it is larger than the sum of its proper divisors (13316186179).

25421809917 is a wasteful number, since it uses less digits than its factorization.

25421809917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210562387.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 25421809917 in words is "twenty-five billion, four hundred twenty-one million, eight hundred nine thousand, nine hundred seventeen".