25066561 has 8 divisors (see below), whose sum is σ = 27096104. Its totient is φ = 23051520.

The previous prime is 25066553. The next prime is 25066577. The reversal of 25066561 is 16566052.

It can be written as a sum of positive squares in 4 ways, for example, as 712336 + 24354225 = 844^2 + 4935^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25066561 - 2³ = 25066553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25066511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121 + ... + 7081.

It is an arithmetic number, because the mean of its divisors is an integer number (3387013).

Almost surely, 2^25066561 is an apocalyptic number.

It is an amenable number.

25066561 is a deficient number, since it is larger than the sum of its proper divisors (2029543).

25066561 is a wasteful number, since it uses less digits than its factorization.

25066561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 25066561 is about 5006.6516755213. The cubic root of 25066561 is about 292.6610445859.

The spelling of 25066561 in words is "twenty-five million, sixty-six thousand, five hundred sixty-one".