25897447488 has 224 divisors, whose sum is σ = 83314275840. Its totient is φ = 6997155840.

The previous prime is 25897447453. The next prime is 25897447493. The reversal of 25897447488 is 88474479852.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 663195 + ... + 701157.

Almost surely, 2^25897447488 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 25897447488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41657137920).

25897447488 is an abundant number, since it is smaller than the sum of its proper divisors (57416828352).

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

25897447488 is a wasteful number, since it uses less digits than its factorization.

25897447488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38025 (or 38015 counting only the distinct ones).

The product of its digits is 144506880, while the sum is 66.

The spelling of 25897447488 in words is "twenty-five billion, eight hundred ninety-seven million, four hundred forty-seven thousand, four hundred eighty-eight".