168911999 has 8 divisors (see below), whose sum is σ = 171606000. Its totient is φ = 166228416.

The previous prime is 168911971. The next prime is 168912011. The reversal of 168911999 is 999119861.

168911999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168911999 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 168911999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168911909) 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, 34109 + ... + 38745.

It is an arithmetic number, because the mean of its divisors is an integer number (21450750).

Almost surely, 2^168911999 is an apocalyptic number.

168911999 is a deficient number, since it is larger than the sum of its proper divisors (2694001).

168911999 is an equidigital number, since it uses as much as digits as its factorization.

168911999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5209.

The product of its digits is 314928, while the sum is 53.

The square root of 168911999 is about 12996.6149054283. The cubic root of 168911999 is about 552.7815006606.

The spelling of 168911999 in words is "one hundred sixty-eight million, nine hundred eleven thousand, nine hundred ninety-nine".