25909359420 has 96 divisors (see below), whose sum is σ = 83108390400. Its totient is φ = 5907965184.

The previous prime is 25909359407. The next prime is 25909359433. The reversal of 25909359420 is 2495390952.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25909359407) and next prime (25909359433).

It is a self number, because there is not a number n which added to its sum of digits gives 25909359420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102366 + ... + 249594.

It is an arithmetic number, because the mean of its divisors is an integer number (865712400).

Almost surely, 2^25909359420 is an apocalyptic number.

25909359420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25909359420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41554195200).

25909359420 is an abundant number, since it is smaller than the sum of its proper divisors (57199030980).

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

25909359420 is a wasteful number, since it uses less digits than its factorization.

25909359420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147667 (or 147665 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 48.

The spelling of 25909359420 in words is "twenty-five billion, nine hundred nine million, three hundred fifty-nine thousand, four hundred twenty".