168681275778 has 32 divisors (see below), whose sum is σ = 345652921152. Its totient is φ = 54845856000.

The previous prime is 168681275773. The next prime is 168681275783. The reversal of 168681275778 is 877572186861.

It is an interprime number because it is at equal distance from previous prime (168681275773) and next prime (168681275783).

It is not an unprimeable number, because it can be changed into a prime (168681275773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1380750 + ... + 1497942.

It is an arithmetic number, because the mean of its divisors is an integer number (10801653786).

Almost surely, 2^168681275778 is an apocalyptic number.

168681275778 is an abundant number, since it is smaller than the sum of its proper divisors (176971645374).

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

168681275778 is a wasteful number, since it uses less digits than its factorization.

168681275778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123090.

The product of its digits is 63221760, while the sum is 66.

The spelling of 168681275778 in words is "one hundred sixty-eight billion, six hundred eighty-one million, two hundred seventy-five thousand, seven hundred seventy-eight".