25317664225 has 18 divisors (see below), whose sum is σ = 36519440694. Its totient is φ = 17360683200.

The previous prime is 25317664223. The next prime is 25317664231. The reversal of 25317664225 is 52246671352.

It can be written as a sum of positive squares in 3 ways, for example, as 6154245601 + 19163418624 = 78449^2 + 138432^2 .

It is not a de Polignac number, because 25317664225 - 2¹ = 25317664223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25317664223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10332516 + ... + 10334965.

Almost surely, 2^25317664225 is an apocalyptic number.

25317664225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25317664225 is a deficient number, since it is larger than the sum of its proper divisors (11201776469).

25317664225 is a wasteful number, since it uses less digits than its factorization.

25317664225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20667505 (or 20667493 counting only the distinct ones).

The product of its digits is 604800, while the sum is 43.

The spelling of 25317664225 in words is "twenty-five billion, three hundred seventeen million, six hundred sixty-four thousand, two hundred twenty-five".