25545666 has 8 divisors (see below), whose sum is σ = 51091344. Its totient is φ = 8515220.

The previous prime is 25545661. The next prime is 25545683. The reversal of 25545666 is 66654552.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

25545666 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25545661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128800 + ... + 2128811.

It is an arithmetic number, because the mean of its divisors is an integer number (6386418).

Almost surely, 2^25545666 is an apocalyptic number.

25545666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25545666 is a wasteful number, since it uses less digits than its factorization.

25545666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257616.

The product of its digits is 216000, while the sum is 39.

The square root of 25545666 is about 5054.2720544110. The cubic root of 25545666 is about 294.5138636950.

The spelling of 25545666 in words is "twenty-five million, five hundred forty-five thousand, six hundred sixty-six".