25581472238 has 12 divisors (see below), whose sum is σ = 44637058872. Its totient is φ = 10963488060.

The previous prime is 25581472223. The next prime is 25581472261. The reversal of 25581472238 is 83227418552.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25581472192 and 25581472201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130517618 + ... + 130517813.

It is an arithmetic number, because the mean of its divisors is an integer number (3719754906).

Almost surely, 2^25581472238 is an apocalyptic number.

25581472238 is a deficient number, since it is larger than the sum of its proper divisors (19055586634).

25581472238 is a wasteful number, since it uses less digits than its factorization.

25581472238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261035447 (or 261035440 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 47.

The spelling of 25581472238 in words is "twenty-five billion, five hundred eighty-one million, four hundred seventy-two thousand, two hundred thirty-eight".