25642481280 has 256 divisors, whose sum is σ = 88395027840. Its totient is φ = 6285312000.

The previous prime is 25642481279. The next prime is 25642481303. The reversal of 25642481280 is 8218424652.

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, 6262914 + ... + 6267006.

Almost surely, 2^25642481280 is an apocalyptic number.

25642481280 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 25642481280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44197513920).

25642481280 is an abundant number, since it is smaller than the sum of its proper divisors (62752546560).

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

25642481280 is a wasteful number, since it uses less digits than its factorization.

25642481280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379 (or 4367 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 42.

The spelling of 25642481280 in words is "twenty-five billion, six hundred forty-two million, four hundred eighty-one thousand, two hundred eighty".