166225565 has 24 divisors (see below), whose sum is σ = 226351104. Its totient is φ = 116978400.

The previous prime is 166225537. The next prime is 166225667. The reversal of 166225565 is 565522661.

It is a happy number.

It is not a de Polignac number, because 166225565 - 2⁸ = 166225309 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14324 + ... + 23186.

It is an arithmetic number, because the mean of its divisors is an integer number (9431296).

Almost surely, 2^166225565 is an apocalyptic number.

It is an amenable number.

166225565 is a deficient number, since it is larger than the sum of its proper divisors (60125539).

166225565 is a wasteful number, since it uses less digits than its factorization.

166225565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8921 (or 8910 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 166225565 is about 12892.8493747503. The cubic root of 166225565 is about 549.8352840085.

The spelling of 166225565 in words is "one hundred sixty-six million, two hundred twenty-five thousand, five hundred sixty-five".