166681668 has 48 divisors (see below), whose sum is σ = 425101824. Its totient is φ = 50603520.

The previous prime is 166681643. The next prime is 166681709. The reversal of 166681668 is 866186661.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6855 + ... + 19502.

It is an arithmetic number, because the mean of its divisors is an integer number (8856288).

Almost surely, 2^166681668 is an apocalyptic number.

It is an amenable number.

166681668 is an abundant number, since it is smaller than the sum of its proper divisors (258420156).

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

166681668 is a wasteful number, since it uses less digits than its factorization.

166681668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26412 (or 26410 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 166681668 is about 12910.5254734267. The cubic root of 166681668 is about 550.3377187575.

It can be divided in two parts, 16668 and 1668, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 166681668 in words is "one hundred sixty-six million, six hundred eighty-one thousand, six hundred sixty-eight".