25944643225 has 12 divisors (see below), whose sum is σ = 33209144320. Its totient is φ = 20086174800.

The previous prime is 25944643223. The next prime is 25944643267. The reversal of 25944643225 is 52234644952.

It is a happy number.

It is not a de Polignac number, because 25944643225 - 2¹ = 25944643223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25944643223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16737705 + ... + 16739254.

Almost surely, 2^25944643225 is an apocalyptic number.

25944643225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25944643225 is a deficient number, since it is larger than the sum of its proper divisors (7264501095).

25944643225 is a wasteful number, since it uses less digits than its factorization.

25944643225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33477000 (or 33476995 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 46.

The spelling of 25944643225 in words is "twenty-five billion, nine hundred forty-four million, six hundred forty-three thousand, two hundred twenty-five".