25861431516 has 24 divisors (see below), whose sum is σ = 60438989184. Its totient is φ = 8606813040.

The previous prime is 25861431511. The next prime is 25861431517. The reversal of 25861431516 is 61513416852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861431511) 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, 1700130 + ... + 1715273.

It is an arithmetic number, because the mean of its divisors is an integer number (2518291216).

Almost surely, 2^25861431516 is an apocalyptic number.

It is an amenable number.

25861431516 is an abundant number, since it is smaller than the sum of its proper divisors (34577557668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25861431516 is a wasteful number, since it uses less digits than its factorization.

25861431516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416041 (or 3416039 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The spelling of 25861431516 in words is "twenty-five billion, eight hundred sixty-one million, four hundred thirty-one thousand, five hundred sixteen".