166666666660 has 48 divisors (see below), whose sum is σ = 376977884976. Its totient is φ = 61529513472.

The previous prime is 166666666651. The next prime is 166666666667. The reversal of 166666666660 is 66666666661.

It can be written as a sum of positive squares in 8 ways, for example, as 7618845796 + 159047820864 = 87286^2 + 398808^2 .

It is not an unprimeable number, because it can be changed into a prime (166666666667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1901154 + ... + 1986886.

It is an arithmetic number, because the mean of its divisors is an integer number (7853705937).

Almost surely, 2^166666666660 is an apocalyptic number.

166666666660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166666666660 is an abundant number, since it is smaller than the sum of its proper divisors (210311218316).

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

166666666660 is a wasteful number, since it uses less digits than its factorization.

166666666660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93232 (or 93230 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 61.

Subtracting from 166666666660 its reverse (66666666661), we obtain a palindrome (99999999999).

The spelling of 166666666660 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty".