25543066 has 4 divisors (see below), whose sum is σ = 38314602. Its totient is φ = 12771532.

The previous prime is 25543051. The next prime is 25543069. The reversal of 25543066 is 66034552.

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

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 8970025 = 4071^2 + 2995^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (25543069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385765 + ... + 6385768.

Almost surely, 2^25543066 is an apocalyptic number.

25543066 is a deficient number, since it is larger than the sum of its proper divisors (12771536).

25543066 is a wasteful number, since it uses less digits than its factorization.

25543066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12771535.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 25543066 is about 5054.0148397091. The cubic root of 25543066 is about 294.5038716279.

The spelling of 25543066 in words is "twenty-five million, five hundred forty-three thousand, sixty-six".