25965990972 has 72 divisors (see below), whose sum is σ = 67892977152. Its totient is φ = 8358890400.

The previous prime is 25965990959. The next prime is 25965991019. The reversal of 25965990972 is 27909956952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 524263 + ... + 571649.

It is an arithmetic number, because the mean of its divisors is an integer number (942958016).

Almost surely, 2^25965990972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25965990972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33946488576).

25965990972 is an abundant number, since it is smaller than the sum of its proper divisors (41926986180).

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

25965990972 is a wasteful number, since it uses less digits than its factorization.

25965990972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47919 (or 47914 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 63.

The spelling of 25965990972 in words is "twenty-five billion, nine hundred sixty-five million, nine hundred ninety thousand, nine hundred seventy-two".