168881688986 has 16 divisors (see below), whose sum is σ = 258152373864. Its totient is φ = 82831517184.

The previous prime is 168881688979. The next prime is 168881688991. The reversal of 168881688986 is 689886188861.

It can be written as a sum of positive squares in 4 ways, for example, as 164020950025 + 4860738961 = 404995^2 + 69719^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402470 + ... + 706926.

Almost surely, 2^168881688986 is an apocalyptic number.

168881688986 is a deficient number, since it is larger than the sum of its proper divisors (89270684878).

168881688986 is a wasteful number, since it uses less digits than its factorization.

168881688986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309745.

The product of its digits is 509607936, while the sum is 77.

The spelling of 168881688986 in words is "one hundred sixty-eight billion, eight hundred eighty-one million, six hundred eighty-eight thousand, nine hundred eighty-six".