25225321540 has 24 divisors (see below), whose sum is σ = 53328706200. Its totient is φ = 10022408448.

The previous prime is 25225321529. The next prime is 25225321547. The reversal of 25225321540 is 4512352252.

It can be written as a sum of positive squares in 4 ways, for example, as 236667456 + 24988654084 = 15384^2 + 158078^2 .

It is not an unprimeable number, because it can be changed into a prime (25225321547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4229457 + ... + 4235416.

It is an arithmetic number, because the mean of its divisors is an integer number (2222029425).

Almost surely, 2^25225321540 is an apocalyptic number.

25225321540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25225321540 is an abundant number, since it is smaller than the sum of its proper divisors (28103384660).

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

25225321540 is a wasteful number, since it uses less digits than its factorization.

25225321540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8465031 (or 8465029 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 25225321540 its reverse (4512352252), we get a palindrome (29737673792).

The spelling of 25225321540 in words is "twenty-five billion, two hundred twenty-five million, three hundred twenty-one thousand, five hundred forty".