25842331809 has 24 divisors (see below), whose sum is σ = 43568029440. Its totient is φ = 14452852608.

The previous prime is 25842331787. The next prime is 25842331829. The reversal of 25842331809 is 90813324852.

It is not a de Polignac number, because 25842331809 - 2⁸ = 25842331553 is a prime.

It is a super-2 number, since 2×25842331809² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25842331829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4360824 + ... + 4366745.

It is an arithmetic number, because the mean of its divisors is an integer number (1815334560).

Almost surely, 2^25842331809 is an apocalyptic number.

It is an amenable number.

25842331809 is a deficient number, since it is larger than the sum of its proper divisors (17725697631).

25842331809 is a wasteful number, since it uses less digits than its factorization.

25842331809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8727629 (or 8727626 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 25842331809 in words is "twenty-five billion, eight hundred forty-two million, three hundred thirty-one thousand, eight hundred nine".