25665912 has 48 divisors (see below), whose sum is σ = 69909840. Its totient is φ = 8506368.

The previous prime is 25665911. The next prime is 25665929. The reversal of 25665912 is 21956652.

25665912 is a `hidden beast` number, since 2 + 5 + 66 + 591 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12973 + ... + 14819.

It is an arithmetic number, because the mean of its divisors is an integer number (1456455).

Almost surely, 2^25665912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25665912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34954920).

25665912 is an abundant number, since it is smaller than the sum of its proper divisors (44243928).

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

25665912 is a wasteful number, since it uses less digits than its factorization.

25665912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2045 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 25665912 is about 5066.1535705109. The cubic root of 25665912 is about 294.9752425838.

The spelling of 25665912 in words is "twenty-five million, six hundred sixty-five thousand, nine hundred twelve".