25666457 has 4 divisors (see below), whose sum is σ = 25704720. Its totient is φ = 25628196.

The previous prime is 25666439. The next prime is 25666477. The reversal of 25666457 is 75466652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25666457 - 2¹⁰ = 25665433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25666477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18107 + ... + 19472.

It is an arithmetic number, because the mean of its divisors is an integer number (6426180).

Almost surely, 2^25666457 is an apocalyptic number.

It is an amenable number.

25666457 is a deficient number, since it is larger than the sum of its proper divisors (38263).

25666457 is an equidigital number, since it uses as much as digits as its factorization.

25666457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38262.

The product of its digits is 302400, while the sum is 41.

The square root of 25666457 is about 5066.2073585672. The cubic root of 25666457 is about 294.9773304422.

It can be divided in two parts, 2566645 and 7, that added together give a palindrome (2566652).

The spelling of 25666457 in words is "twenty-five million, six hundred sixty-six thousand, four hundred fifty-seven".