25355782508 has 48 divisors (see below), whose sum is σ = 52621836288. Its totient is φ = 10461096000.

The previous prime is 25355782481. The next prime is 25355782519. The reversal of 25355782508 is 80528755352.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89318 + ... + 242258.

It is an arithmetic number, because the mean of its divisors is an integer number (1096288256).

Almost surely, 2^25355782508 is an apocalyptic number.

25355782508 is a gapful number since it is divisible by the number (28) 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 25355782508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26310918144).

25355782508 is an abundant number, since it is smaller than the sum of its proper divisors (27266053780).

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

25355782508 is a wasteful number, since it uses less digits than its factorization.

25355782508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153174 (or 153172 counting only the distinct ones).

The product of its (nonzero) digits is 3360000, while the sum is 50.

The spelling of 25355782508 in words is "twenty-five billion, three hundred fifty-five million, seven hundred eighty-two thousand, five hundred eight".