25543744225 has 48 divisors (see below), whose sum is σ = 33401433600. Its totient is φ = 19340640000.

The previous prime is 25543744217. The next prime is 25543744253. The reversal of 25543744225 is 52244734552.

It is a happy number.

It is not a de Polignac number, because 25543744225 - 2³ = 25543744217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34012600 + ... + 34013350.

It is an arithmetic number, because the mean of its divisors is an integer number (695863200).

Almost surely, 2^25543744225 is an apocalyptic number.

25543744225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25543744225 is a deficient number, since it is larger than the sum of its proper divisors (7857689375).

25543744225 is a wasteful number, since it uses less digits than its factorization.

25543744225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 1325 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 43.

The spelling of 25543744225 in words is "twenty-five billion, five hundred forty-three million, seven hundred forty-four thousand, two hundred twenty-five".