25299528520 has 128 divisors (see below), whose sum is σ = 69242169600. Its totient is φ = 8121286656.

The previous prime is 25299528497. The next prime is 25299528539. The reversal of 25299528520 is 2582599252.

It is a super-2 number, since 2×25299528520² (a number of 22 digits) contains 22 as substring.

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, 904911 + ... + 932449.

It is an arithmetic number, because the mean of its divisors is an integer number (540954450).

Almost surely, 2^25299528520 is an apocalyptic number.

25299528520 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 25299528520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34621084800).

25299528520 is an abundant number, since it is smaller than the sum of its proper divisors (43942641080).

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

25299528520 is a wasteful number, since it uses less digits than its factorization.

25299528520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27767 (or 27763 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 25299528520 in words is "twenty-five billion, two hundred ninety-nine million, five hundred twenty-eight thousand, five hundred twenty".