166109965 has 16 divisors (see below), whose sum is σ = 229553280. Its totient is φ = 113031360.

The previous prime is 166109947. The next prime is 166109969. The reversal of 166109965 is 569901661.

166109965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166109965 - 2¹⁷ = 165978893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166109969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13530 + ... + 22699.

It is an arithmetic number, because the mean of its divisors is an integer number (14347080).

Almost surely, 2^166109965 is an apocalyptic number.

It is an amenable number.

166109965 is a deficient number, since it is larger than the sum of its proper divisors (63443315).

166109965 is a wasteful number, since it uses less digits than its factorization.

166109965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36372.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 166109965 is about 12888.3654898517. The cubic root of 166109965 is about 549.7077951977.

The spelling of 166109965 in words is "one hundred sixty-six million, one hundred nine thousand, nine hundred sixty-five".