25222204225 has 27 divisors (see below), whose sum is σ = 32718152649. Its totient is φ = 19286493600.

The previous prime is 25222204193. The next prime is 25222204237. The reversal of 25222204225 is 52240222252.

It is a happy number.

The square root of 25222204225 is 158815.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 876219201 + 24345985024 = 29601^2 + 156032^2 .

It is not a de Polignac number, because 25222204225 - 2⁵ = 25222204193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25222204193 and 25222204202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18263035 + ... + 18264415.

Almost surely, 2^25222204225 is an apocalyptic number.

25222204225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25222204225 is the 158815-th square number.

25222204225 is the 79408-th centered octagonal number.

It is an amenable number.

25222204225 is a deficient number, since it is larger than the sum of its proper divisors (7495948424).

25222204225 is an frugal number, since it uses more digits than its factorization.

25222204225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

Adding to 25222204225 its reverse (52240222252), we get a palindrome (77462426477).

The spelling of 25222204225 in words is "twenty-five billion, two hundred twenty-two million, two hundred four thousand, two hundred twenty-five".