25509993288 has 64 divisors (see below), whose sum is σ = 68900442240. Its totient is φ = 7824121344.

The previous prime is 25509993287. The next prime is 25509993293. The reversal of 25509993288 is 88239990552.

It is not an unprimeable number, because it can be changed into a prime (25509993287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32956 + ... + 228267.

It is an arithmetic number, because the mean of its divisors is an integer number (1076569410).

Almost surely, 2^25509993288 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 25509993288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34450221120).

25509993288 is an abundant number, since it is smaller than the sum of its proper divisors (43390448952).

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

25509993288 is a wasteful number, since it uses less digits than its factorization.

25509993288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261558 (or 261554 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 60.

The spelling of 25509993288 in words is "twenty-five billion, five hundred nine million, nine hundred ninety-three thousand, two hundred eighty-eight".