1166566225 has 12 divisors (see below), whose sum is σ = 1578046320. Its totient is φ = 848411600.

The previous prime is 1166566223. The next prime is 1166566241. The reversal of 1166566225 is 5226656611.

It is not a de Polignac number, because 1166566225 - 2¹ = 1166566223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1166566223) 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, 2120755 + ... + 2121304.

It is an arithmetic number, because the mean of its divisors is an integer number (131503860).

Almost surely, 2^1166566225 is an apocalyptic number.

It is an amenable number.

1166566225 is a deficient number, since it is larger than the sum of its proper divisors (411480095).

1166566225 is a wasteful number, since it uses less digits than its factorization.

1166566225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242080 (or 4242075 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 1166566225 is about 34155.0322061040. The cubic root of 1166566225 is about 1052.6963879955.

The spelling of 1166566225 in words is "one billion, one hundred sixty-six million, five hundred sixty-six thousand, two hundred twenty-five".