25258721280 has 512 divisors, whose sum is σ = 89840620800. Its totient is φ = 6020923392.

The previous prime is 25258721219. The next prime is 25258721309. The reversal of 25258721280 is 8212785252.

It is a tau number, because it is divible by the number of its divisors (512).

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, 376995807 + ... + 376995873.

Almost surely, 2^25258721280 is an apocalyptic number.

25258721280 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 25258721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44920310400).

25258721280 is an abundant number, since it is smaller than the sum of its proper divisors (64581899520).

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

25258721280 is an equidigital number, since it uses as much as digits as its factorization.

25258721280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 42.

The spelling of 25258721280 in words is "twenty-five billion, two hundred fifty-eight million, seven hundred twenty-one thousand, two hundred eighty".