25440412220 has 48 divisors (see below), whose sum is σ = 53887081248. Its totient is φ = 10088282880.

The previous prime is 25440412213. The next prime is 25440412243. The reversal of 25440412220 is 2221404452.

It is a self number, because there is not a number n which added to its sum of digits gives 25440412220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2922194 + ... + 2930886.

It is an arithmetic number, because the mean of its divisors is an integer number (1122647526).

Almost surely, 2^25440412220 is an apocalyptic number.

25440412220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25440412220 is an abundant number, since it is smaller than the sum of its proper divisors (28446669028).

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

25440412220 is a wasteful number, since it uses less digits than its factorization.

25440412220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9950 (or 9948 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 25440412220 its reverse (2221404452), we get a palindrome (27661816672).

The spelling of 25440412220 in words is "twenty-five billion, four hundred forty million, four hundred twelve thousand, two hundred twenty".