25643361 has 24 divisors (see below), whose sum is σ = 37104480. Its totient is φ = 15698176.

The previous prime is 25643357. The next prime is 25643383. The reversal of 25643361 is 16334652.

It is not a de Polignac number, because 25643361 - 2² = 25643357 is a prime.

It is a super-3 number, since 3×25643361³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25643311) 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 23 ways as a sum of consecutive naturals, for example, 143170 + ... + 143348.

It is an arithmetic number, because the mean of its divisors is an integer number (1546020).

Almost surely, 2^25643361 is an apocalyptic number.

It is an amenable number.

25643361 is a deficient number, since it is larger than the sum of its proper divisors (11461119).

25643361 is a wasteful number, since it uses less digits than its factorization.

25643361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 252 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 25643361 is about 5063.9274283899. The cubic root of 25643361 is about 294.8888252913. Note that the first 4 decimals are identical.

The spelling of 25643361 in words is "twenty-five million, six hundred forty-three thousand, three hundred sixty-one".