166666515808 has 24 divisors (see below), whose sum is σ = 353365065648. Its totient is φ = 76923007104.

The previous prime is 166666515803. The next prime is 166666515833. The reversal of 166666515808 is 808515666661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666515803) 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 3 ways as a sum of consecutive naturals, for example, 200319916 + ... + 200320747.

It is an arithmetic number, because the mean of its divisors is an integer number (14723544402).

Almost surely, 2^166666515808 is an apocalyptic number.

It is an amenable number.

166666515808 is an abundant number, since it is smaller than the sum of its proper divisors (186698549840).

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

166666515808 is a wasteful number, since it uses less digits than its factorization.

166666515808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400640686 (or 400640678 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 58.

The spelling of 166666515808 in words is "one hundred sixty-six billion, six hundred sixty-six million, five hundred fifteen thousand, eight hundred eight".