25665222 has 32 divisors (see below), whose sum is σ = 56795904. Its totient is φ = 7666400.

The previous prime is 25665193. The next prime is 25665239. The reversal of 25665222 is 22256652.

It is a self number, because there is not a number n which added to its sum of digits gives 25665222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1948 + ... + 7424.

It is an arithmetic number, because the mean of its divisors is an integer number (1774872).

Almost surely, 2^25665222 is an apocalyptic number.

25665222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 25665222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28397952).

25665222 is an abundant number, since it is smaller than the sum of its proper divisors (31130682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25665222 is a wasteful number, since it uses less digits than its factorization.

25665222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5564.

The product of its digits is 14400, while the sum is 30.

The square root of 25665222 is about 5066.0854710516. The cubic root of 25665222 is about 294.9725991978.

The spelling of 25665222 in words is "twenty-five million, six hundred sixty-five thousand, two hundred twenty-two".