25661853 has 20 divisors (see below), whose sum is σ = 43811680. Its totient is φ = 14663592.

The previous prime is 25661849. The next prime is 25661869. The reversal of 25661853 is 35816652.

It is not a de Polignac number, because 25661853 - 2² = 25661849 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 (25661833) 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 19 ways as a sum of consecutive naturals, for example, 22063 + ... + 23196.

It is an arithmetic number, because the mean of its divisors is an integer number (2190584).

Almost surely, 2^25661853 is an apocalyptic number.

It is an amenable number.

25661853 is a deficient number, since it is larger than the sum of its proper divisors (18149827).

25661853 is an equidigital number, since it uses as much as digits as its factorization.

25661853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45278 (or 45269 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 25661853 is about 5065.7529548923. The cubic root of 25661853 is about 294.9596918976.

The spelling of 25661853 in words is "twenty-five million, six hundred sixty-one thousand, eight hundred fifty-three".