25665213 has 16 divisors (see below), whose sum is σ = 39223296. Its totient is φ = 14622960.

The previous prime is 25665193. The next prime is 25665239. The reversal of 25665213 is 31256652.

It is not a de Polignac number, because 25665213 - 2⁹ = 25664701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665113) 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, 6448 + ... + 9638.

It is an arithmetic number, because the mean of its divisors is an integer number (2451456).

Almost surely, 2^25665213 is an apocalyptic number.

It is an amenable number.

25665213 is a deficient number, since it is larger than the sum of its proper divisors (13558083).

25665213 is a wasteful number, since it uses less digits than its factorization.

25665213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584.

The product of its digits is 10800, while the sum is 30.

The square root of 25665213 is about 5066.0845827917. The cubic root of 25665213 is about 294.9725647185.

It can be divided in two parts, 25665 and 213, that multiplied together give a palindrome (5466645).

The spelling of 25665213 in words is "twenty-five million, six hundred sixty-five thousand, two hundred thirteen".