25541643 has 16 divisors (see below), whose sum is σ = 36185600. Its totient is φ = 15979680.

The previous prime is 25541639. The next prime is 25541651. The reversal of 25541643 is 34614552.

It is not a de Polignac number, because 25541643 - 2² = 25541639 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25541643.

It is not an unprimeable number, because it can be changed into a prime (25541603) 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, 4158 + ... + 8268.

It is an arithmetic number, because the mean of its divisors is an integer number (2261600).

Almost surely, 2^25541643 is an apocalyptic number.

25541643 is a deficient number, since it is larger than the sum of its proper divisors (10643957).

25541643 is a wasteful number, since it uses less digits than its factorization.

25541643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242.

The product of its digits is 14400, while the sum is 30.

The square root of 25541643 is about 5053.8740585812. The cubic root of 25541643 is about 294.4984026056.

The spelling of 25541643 in words is "twenty-five million, five hundred forty-one thousand, six hundred forty-three".