168899999 has 4 divisors (see below), whose sum is σ = 172493664. Its totient is φ = 165306336.

The previous prime is 168899953. The next prime is 168900013. The reversal of 168899999 is 999998861.

168899999 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168899999 is a prime.

It is a super-4 number, since 4×168899999⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

168899999 is a modest number, since divided by 99999 gives 1688 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168899909) 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, 1796762 + ... + 1796855.

It is an arithmetic number, because the mean of its divisors is an integer number (43123416).

Almost surely, 2^168899999 is an apocalyptic number.

168899999 is a deficient number, since it is larger than the sum of its proper divisors (3593665).

168899999 is an equidigital number, since it uses as much as digits as its factorization.

168899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593664.

The product of its digits is 22674816, while the sum is 68.

The square root of 168899999 is about 12996.1532385549. The cubic root of 168899999 is about 552.7684099484.

The spelling of 168899999 in words is "one hundred sixty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".