25641566 has 4 divisors (see below), whose sum is σ = 38462352. Its totient is φ = 12820782.

The previous prime is 25641563. The next prime is 25641589. The reversal of 25641566 is 66514652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410390 + ... + 6410393.

It is an arithmetic number, because the mean of its divisors is an integer number (9615588).

Almost surely, 2^25641566 is an apocalyptic number.

25641566 is a deficient number, since it is larger than the sum of its proper divisors (12820786).

25641566 is a wasteful number, since it uses less digits than its factorization.

25641566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12820785.

The product of its digits is 43200, while the sum is 35.

The square root of 25641566 is about 5063.7501913108. The cubic root of 25641566 is about 294.8819445267.

The spelling of 25641566 in words is "twenty-five million, six hundred forty-one thousand, five hundred sixty-six".