25451989312 has 56 divisors (see below), whose sum is σ = 51122961000. Its totient is φ = 12570894336.

The previous prime is 25451989309. The next prime is 25451989319. The reversal of 25451989312 is 21398915452.

It can be written as a sum of positive squares in 4 ways, for example, as 747694336 + 24704294976 = 27344^2 + 157176^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25451989319) 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, 9983814 + ... + 9986362.

Almost surely, 2^25451989312 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 25451989312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25561480500).

25451989312 is an abundant number, since it is smaller than the sum of its proper divisors (25670971688).

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

25451989312 is a wasteful number, since it uses less digits than its factorization.

25451989312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403 (or 4393 counting only the distinct ones).

The product of its digits is 777600, while the sum is 49.

The spelling of 25451989312 in words is "twenty-five billion, four hundred fifty-one million, nine hundred eighty-nine thousand, three hundred twelve".