25666716205225 has 12 divisors (see below), whose sum is σ = 33501819047440. Its totient is φ = 19452669123600.

The previous prime is 25666716205199. The next prime is 25666716205231. The reversal of 25666716205225 is 52250261766652.

It is not a de Polignac number, because 25666716205225 - 2¹⁵ = 25666716172457 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27017595531 + ... + 27017596480.

Almost surely, 2^{25666716205225} is an apocalyptic number.

25666716205225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25666716205225 is a deficient number, since it is larger than the sum of its proper divisors (7835102842215).

25666716205225 is a wasteful number, since it uses less digits than its factorization.

25666716205225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54035192040 (or 54035192035 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 25666716205225 in words is "twenty-five trillion, six hundred sixty-six billion, seven hundred sixteen million, two hundred five thousand, two hundred twenty-five".