166681818037 has 16 divisors (see below), whose sum is σ = 195773473152. Its totient is φ = 138915345600.

The previous prime is 166681818011. The next prime is 166681818091. The reversal of 166681818037 is 730818186661.

It is a de Polignac number, because none of the positive numbers 2^k-166681818037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166681818937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171162 + ... + 602212.

It is an arithmetic number, because the mean of its divisors is an integer number (12235842072).

Almost surely, 2^166681818037 is an apocalyptic number.

It is an amenable number.

166681818037 is a deficient number, since it is larger than the sum of its proper divisors (29091655115).

166681818037 is a wasteful number, since it uses less digits than its factorization.

166681818037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432588.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 166681818037 in words is "one hundred sixty-six billion, six hundred eighty-one million, eight hundred eighteen thousand, thirty-seven".