166681818344 has 16 divisors (see below), whose sum is σ = 314255088420. Its totient is φ = 82880461440.

The previous prime is 166681818341. The next prime is 166681818353. The reversal of 166681818344 is 443818186661.

It can be written as a sum of positive squares in 2 ways, for example, as 163014062500 + 3667755844 = 403750^2 + 60562^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166681818344.

It is not an unprimeable number, because it can be changed into a prime (166681818341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57554429 + ... + 57557324.

Almost surely, 2^166681818344 is an apocalyptic number.

It is an amenable number.

166681818344 is a deficient number, since it is larger than the sum of its proper divisors (147573270076).

166681818344 is a wasteful number, since it uses less digits than its factorization.

166681818344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115111940 (or 115111936 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 56.

The spelling of 166681818344 in words is "one hundred sixty-six billion, six hundred eighty-one million, eight hundred eighteen thousand, three hundred forty-four".