25561803 has 8 divisors (see below), whose sum is σ = 34172928. Its totient is φ = 16995944.

The previous prime is 25561777. The next prime is 25561817. The reversal of 25561803 is 30816552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25561803 - 2¹⁶ = 25496267 is a prime.

It is a super-2 number, since 2×25561803² = 1306811545221618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25561853) 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 in 7 ways as a sum of consecutive naturals, for example, 9975 + ... + 12272.

It is an arithmetic number, because the mean of its divisors is an integer number (4271616).

Almost surely, 2^25561803 is an apocalyptic number.

25561803 is a deficient number, since it is larger than the sum of its proper divisors (8611125).

25561803 is a wasteful number, since it uses less digits than its factorization.

25561803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22633.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 25561803 is about 5055.8681747055. The cubic root of 25561803 is about 294.5758646863.

The spelling of 25561803 in words is "twenty-five million, five hundred sixty-one thousand, eight hundred three".