25666282849 has 3 divisors (see below), whose sum is σ = 25666443057. Its totient is φ = 25666122642.

The previous prime is 25666282847. The next prime is 25666282853. The reversal of 25666282849 is 94828266652.

The square root of 25666282849 is 160207.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 25666282849 - 2¹ = 25666282847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25666282793 and 25666282802.

It is not an unprimeable number, because it can be changed into a prime (25666282841) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 80104 + ... + 240310.

It is an arithmetic number, because the mean of its divisors is an integer number (8555481019).

Almost surely, 2^25666282849 is an apocalyptic number.

25666282849 is the 160207-th square number.

25666282849 is the 80104-th centered octagonal number.

It is an amenable number.

25666282849 is a deficient number, since it is larger than the sum of its proper divisors (160208).

25666282849 is an frugal number, since it uses more digits than its factorization.

25666282849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320414 (or 160207 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 58.

The spelling of 25666282849 in words is "twenty-five billion, six hundred sixty-six million, two hundred eighty-two thousand, eight hundred forty-nine".