166109983 has 16 divisors (see below), whose sum is σ = 188225856. Its totient is φ = 145532160.

The previous prime is 166109981. The next prime is 166109987. The reversal of 166109983 is 389901661.

It is a cyclic number.

It is not a de Polignac number, because 166109983 - 2¹ = 166109981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166109981) 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, 15510 + ... + 23932.

It is an arithmetic number, because the mean of its divisors is an integer number (11764116).

Almost surely, 2^166109983 is an apocalyptic number.

166109983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166109983 is a deficient number, since it is larger than the sum of its proper divisors (22115873).

166109983 is a wasteful number, since it uses less digits than its factorization.

166109983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8514.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 166109983 is about 12888.3661881559. The cubic root of 166109983 is about 549.7078150535.

The spelling of 166109983 in words is "one hundred sixty-six million, one hundred nine thousand, nine hundred eighty-three".