999180168 has 384 divisors, whose sum is σ = 3350833920. Its totient is φ = 246005760.

The previous prime is 999180157. The next prime is 999180211. The reversal of 999180168 is 861081999.

It is a happy number.

999180168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×999180168² = 1996722016249016448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 999180168.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18852430 + ... + 18852482.

It is an arithmetic number, because the mean of its divisors is an integer number (8726130).

Almost surely, 2^999180168 is an apocalyptic number.

999180168 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999180168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1675416960).

999180168 is an abundant number, since it is smaller than the sum of its proper divisors (2351653752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999180168 is a wasteful number, since it uses less digits than its factorization.

999180168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 999180168 is about 31609.8112616953. The cubic root of 999180168 is about 999.7266479521.

The spelling of 999180168 in words is "nine hundred ninety-nine million, one hundred eighty thousand, one hundred sixty-eight".