166205065 has 32 divisors (see below), whose sum is σ = 230025600. Its totient is φ = 114255360.

The previous prime is 166205063. The next prime is 166205077. The reversal of 166205065 is 560502661.

It is not a de Polignac number, because 166205065 - 2¹ = 166205063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166205063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71725 + ... + 74005.

It is an arithmetic number, because the mean of its divisors is an integer number (7188300).

Almost surely, 2^166205065 is an apocalyptic number.

It is an amenable number.

166205065 is a deficient number, since it is larger than the sum of its proper divisors (63820535).

166205065 is a wasteful number, since it uses less digits than its factorization.

166205065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377.

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

The square root of 166205065 is about 12892.0543359078. The cubic root of 166205065 is about 549.8126800111.

It can be divided in two parts, 16 and 6205065, that added together give a square (6205081 = 2491²).

The spelling of 166205065 in words is "one hundred sixty-six million, two hundred five thousand, sixty-five".