25220004025 has 12 divisors (see below), whose sum is σ = 31431556332. Its totient is φ = 20073583040.

The previous prime is 25220003993. The next prime is 25220004031. The reversal of 25220004025 is 52040002252.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4500128889 + 20719875136 = 67083^2 + 143944^2 .

It is not a de Polignac number, because 25220004025 - 2⁵ = 25220003993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25220003987 and 25220004005.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2555482 + ... + 2565331.

It is an arithmetic number, because the mean of its divisors is an integer number (2619296361).

Almost surely, 2^25220004025 is an apocalyptic number.

25220004025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25220004025 is a deficient number, since it is larger than the sum of its proper divisors (6211552307).

25220004025 is a wasteful number, since it uses less digits than its factorization.

25220004025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121020 (or 5121015 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

Adding to 25220004025 its reverse (52040002252), we get a palindrome (77260006277).

The spelling of 25220004025 in words is "twenty-five billion, two hundred twenty million, four thousand, twenty-five".