25664646225 has 12 divisors (see below), whose sum is σ = 42432215216. Its totient is φ = 13687811280.

The previous prime is 25664646199. The next prime is 25664646247. The reversal of 25664646225 is 52264646652.

It is not a de Polignac number, because 25664646225 - 2⁷ = 25664646097 is a prime.

It is a Duffinian number.

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, 171097567 + ... + 171097716.

Almost surely, 2^25664646225 is an apocalyptic number.

25664646225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25664646225 is a deficient number, since it is larger than the sum of its proper divisors (16767568991).

25664646225 is a wasteful number, since it uses less digits than its factorization.

25664646225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342195296 (or 342195291 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 48.

The spelling of 25664646225 in words is "twenty-five billion, six hundred sixty-four million, six hundred forty-six thousand, two hundred twenty-five".