168722866 has 8 divisors (see below), whose sum is σ = 272552364. Its totient is φ = 77872080.

The previous prime is 168722819. The next prime is 168722881. The reversal of 168722866 is 668227861.

It can be written as a sum of positive squares in 2 ways, for example, as 164224225 + 4498641 = 12815^2 + 2121^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×168722866² = 56934811022507912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3244645 + ... + 3244696.

Almost surely, 2^168722866 is an apocalyptic number.

168722866 is a deficient number, since it is larger than the sum of its proper divisors (103829498).

168722866 is a wasteful number, since it uses less digits than its factorization.

168722866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6489356.

The product of its digits is 387072, while the sum is 46.

The square root of 168722866 is about 12989.3366266334. The cubic root of 168722866 is about 552.5751046867.

The spelling of 168722866 in words is "one hundred sixty-eight million, seven hundred twenty-two thousand, eight hundred sixty-six".