168159978 has 24 divisors (see below), whose sum is σ = 416396448. Its totient is φ = 48045672.

The previous prime is 168159973. The next prime is 168159991. The reversal of 168159978 is 879951861.

168159978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168159973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 667176 + ... + 667427.

It is an arithmetic number, because the mean of its divisors is an integer number (17349852).

Almost surely, 2^168159978 is an apocalyptic number.

168159978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168159978 is an abundant number, since it is smaller than the sum of its proper divisors (248236470).

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

168159978 is a wasteful number, since it uses less digits than its factorization.

168159978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334618 (or 1334615 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 168159978 is about 12967.6512136932. The cubic root of 168159978 is about 551.9599254146.

The spelling of 168159978 in words is "one hundred sixty-eight million, one hundred fifty-nine thousand, nine hundred seventy-eight".