166666666666 has 24 divisors (see below), whose sum is σ = 260114080896. Its totient is φ = 80009679960.

The previous prime is 166666666651. The next prime is 166666666667. The reversal of 166666666666 is 666666666661.

It is a happy number.

166666666666 is a modest number, since divided by 666666 gives 166666 as remainder.

It is a plaindrome in base 10.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 916665 + ... + 1083331.

It is an arithmetic number, because the mean of its divisors is an integer number (10838086704).

Almost surely, 2^166666666666 is an apocalyptic number.

166666666666 is a deficient number, since it is larger than the sum of its proper divisors (93447414230).

166666666666 is a wasteful number, since it uses less digits than its factorization.

166666666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166954 (or 166827 counting only the distinct ones).

The product of its digits is 362797056, while the sum is 67.

The spelling of 166666666666 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-six".