25643559 has 16 divisors (see below), whose sum is σ = 36108800. Its totient is φ = 16142976.

The previous prime is 25643557. The next prime is 25643561. The reversal of 25643559 is 95534652.

It is an interprime number because it is at equal distance from previous prime (25643557) and next prime (25643561).

It is not a de Polignac number, because 25643559 - 2¹ = 25643557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24162 + ... + 25200.

It is an arithmetic number, because the mean of its divisors is an integer number (2256800).

Almost surely, 2^25643559 is an apocalyptic number.

25643559 is a deficient number, since it is larger than the sum of its proper divisors (10465241).

25643559 is a wasteful number, since it uses less digits than its factorization.

25643559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494.

The product of its digits is 162000, while the sum is 39.

The square root of 25643559 is about 5063.9469783954. The cubic root of 25643559 is about 294.8895842641.

The spelling of 25643559 in words is "twenty-five million, six hundred forty-three thousand, five hundred fifty-nine".