25225244220 has 48 divisors (see below), whose sum is σ = 77051657088. Its totient is φ = 6115210560.

The previous prime is 25225244197. The next prime is 25225244221. The reversal of 25225244220 is 2244252252.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25225244221) 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, 19109374 + ... + 19110693.

It is an arithmetic number, because the mean of its divisors is an integer number (1605242856).

Almost surely, 2^25225244220 is an apocalyptic number.

25225244220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25225244220 is an abundant number, since it is smaller than the sum of its proper divisors (51826412868).

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

25225244220 is a wasteful number, since it uses less digits than its factorization.

25225244220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38220090 (or 38220088 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 30.

Adding to 25225244220 its reverse (2244252252), we get a palindrome (27469496472).

The spelling of 25225244220 in words is "twenty-five billion, two hundred twenty-five million, two hundred forty-four thousand, two hundred twenty".