25318661 has 16 divisors (see below), whose sum is σ = 27993600. Its totient is φ = 22794240.

The previous prime is 25318651. The next prime is 25318669. The reversal of 25318661 is 16681352.

25318661 = T₄₂₆ + T₄₂₇ + ... + T₆₁₁.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25318661 - 2¹⁰ = 25317637 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 (25318669) 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, 56165 + ... + 56613.

It is an arithmetic number, because the mean of its divisors is an integer number (1749600).

Almost surely, 2^25318661 is an apocalyptic number.

It is an amenable number.

25318661 is a deficient number, since it is larger than the sum of its proper divisors (2674939).

25318661 is a wasteful number, since it uses less digits than its factorization.

25318661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604.

The product of its digits is 8640, while the sum is 32.

The square root of 25318661 is about 5031.7651972245. The cubic root of 25318661 is about 293.6388928831.

The spelling of 25318661 in words is "twenty-five million, three hundred eighteen thousand, six hundred sixty-one".