25565671 has 4 divisors (see below), whose sum is σ = 27069552. Its totient is φ = 24061792.

The previous prime is 25565653. The next prime is 25565689. The reversal of 25565671 is 17656552.

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

It is an interprime number because it is at equal distance from previous prime (25565653) and next prime (25565689).

It is a cyclic number.

It is not a de Polignac number, because 25565671 - 2¹³ = 25557479 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 25565671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25565641) 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, 751915 + ... + 751948.

It is an arithmetic number, because the mean of its divisors is an integer number (6767388).

Almost surely, 2^25565671 is an apocalyptic number.

25565671 is a deficient number, since it is larger than the sum of its proper divisors (1503881).

25565671 is a wasteful number, since it uses less digits than its factorization.

25565671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503880.

The product of its digits is 63000, while the sum is 37.

The square root of 25565671 is about 5056.2506860321. The cubic root of 25565671 is about 294.5907222973.

The spelling of 25565671 in words is "twenty-five million, five hundred sixty-five thousand, six hundred seventy-one".