163866689 has 8 divisors (see below), whose sum is σ = 198292608. Its totient is φ = 132194880.

The previous prime is 163866667. The next prime is 163866701. The reversal of 163866689 is 986668361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163866689 - 2⁸ = 163866433 is a prime.

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 163866689.

It is not an unprimeable number, because it can be changed into a prime (163866649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688397 + ... + 688634.

It is an arithmetic number, because the mean of its divisors is an integer number (24786576).

Almost surely, 2^163866689 is an apocalyptic number.

It is an amenable number.

163866689 is a deficient number, since it is larger than the sum of its proper divisors (34425919).

163866689 is a wasteful number, since it uses less digits than its factorization.

163866689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377055.

The product of its digits is 2239488, while the sum is 53.

The square root of 163866689 is about 12801.0424966094. The cubic root of 163866689 is about 547.2220132687. Note that the first 3 decimals are identical.

The spelling of 163866689 in words is "one hundred sixty-three million, eight hundred sixty-six thousand, six hundred eighty-nine".