166109963 has 4 divisors (see below), whose sum is σ = 166697208. Its totient is φ = 165522720.

The previous prime is 166109947. The next prime is 166109969. The reversal of 166109963 is 369901661.

166109963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 369901661 = 4561 ⋅81101.

It is a cyclic number.

It is not a de Polignac number, because 166109963 - 2⁴ = 166109947 is a prime.

It is a super-3 number, since 3×166109963³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166109963.

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 3 ways as a sum of consecutive naturals, for example, 293198 + ... + 293763.

It is an arithmetic number, because the mean of its divisors is an integer number (41674302).

Almost surely, 2^166109963 is an apocalyptic number.

166109963 is a deficient number, since it is larger than the sum of its proper divisors (587245).

166109963 is an equidigital number, since it uses as much as digits as its factorization.

166109963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587244.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 166109963 is about 12888.3654122623. The cubic root of 166109963 is about 549.7077929915.

The spelling of 166109963 in words is "one hundred sixty-six million, one hundred nine thousand, nine hundred sixty-three".