168722666 has 16 divisors (see below), whose sum is σ = 289578240. Its totient is φ = 72224880.

The previous prime is 168722663. The next prime is 168722681. The reversal of 168722666 is 666227861.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168722663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6140 + ... + 19368.

It is an arithmetic number, because the mean of its divisors is an integer number (18098640).

Almost surely, 2^168722666 is an apocalyptic number.

168722666 is a deficient number, since it is larger than the sum of its proper divisors (120855574).

168722666 is a wasteful number, since it uses less digits than its factorization.

168722666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14149.

The product of its digits is 290304, while the sum is 44.

The square root of 168722666 is about 12989.3289280086. The cubic root of 168722666 is about 552.5748863503.

The spelling of 168722666 in words is "one hundred sixty-eight million, seven hundred twenty-two thousand, six hundred sixty-six".