166666311704816 has 160 divisors (see below), whose sum is σ = 406225727175168. Its totient is φ = 64349762641920.

The previous prime is 166666311704797. The next prime is 166666311704831. The reversal of 166666311704816 is 618407113666661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 880168100 + ... + 880357436.

Almost surely, 2^{166666311704816} is an apocalyptic number.

166666311704816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166666311704816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203112863587584).

166666311704816 is an abundant number, since it is smaller than the sum of its proper divisors (239559415470352).

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

166666311704816 is a wasteful number, since it uses less digits than its factorization.

166666311704816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195799 (or 195793 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 166666311704816 in words is "one hundred sixty-six trillion, six hundred sixty-six billion, three hundred eleven million, seven hundred four thousand, eight hundred sixteen".