25525272820 has 48 divisors (see below), whose sum is σ = 54128728080. Its totient is φ = 10110357504.

The previous prime is 25525272803. The next prime is 25525272821. The reversal of 25525272820 is 2827252552.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4824969444 + 20700303376 = 69462^2 + 143876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25525272821) 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, 1109272 + ... + 1132048.

It is an arithmetic number, because the mean of its divisors is an integer number (1127681835).

Almost surely, 2^25525272820 is an apocalyptic number.

25525272820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25525272820 is an abundant number, since it is smaller than the sum of its proper divisors (28603455260).

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

25525272820 is a wasteful number, since it uses less digits than its factorization.

25525272820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23332 (or 23330 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 40.

The spelling of 25525272820 in words is "twenty-five billion, five hundred twenty-five million, two hundred seventy-two thousand, eight hundred twenty".