168256533178 has 4 divisors (see below), whose sum is σ = 252384799770. Its totient is φ = 84128266588.

The previous prime is 168256533163. The next prime is 168256533187. The reversal of 168256533178 is 871335652861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 871335652861 = 53 ⋅16440295337.

It can be written as a sum of positive squares in only one way, i.e., 158645279809 + 9611253369 = 398303^2 + 98037^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42064133293 + ... + 42064133296.

Almost surely, 2^168256533178 is an apocalyptic number.

168256533178 is a deficient number, since it is larger than the sum of its proper divisors (84128266592).

168256533178 is an equidigital number, since it uses as much as digits as its factorization.

168256533178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84128266591.

The product of its digits is 7257600, while the sum is 55.

The spelling of 168256533178 in words is "one hundred sixty-eight billion, two hundred fifty-six million, five hundred thirty-three thousand, one hundred seventy-eight".