25570781632 has 56 divisors (see below), whose sum is σ = 55465748352. Its totient is φ = 11599814400.

The previous prime is 25570781627. The next prime is 25570781671. The reversal of 25570781632 is 23618707552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318007 + ... + 390217.

It is an arithmetic number, because the mean of its divisors is an integer number (990459792).

Almost surely, 2^25570781632 is an apocalyptic number.

25570781632 is a gapful number since it is divisible by the number (22) 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 25570781632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27732874176).

25570781632 is an abundant number, since it is smaller than the sum of its proper divisors (29894966720).

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

25570781632 is a wasteful number, since it uses less digits than its factorization.

25570781632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72737 (or 72727 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 46.

The spelling of 25570781632 in words is "twenty-five billion, five hundred seventy million, seven hundred eighty-one thousand, six hundred thirty-two".