166681818307 has 8 divisors (see below), whose sum is σ = 169037303040. Its totient is φ = 164341779840.

The previous prime is 166681818299. The next prime is 166681818313. The reversal of 166681818307 is 703818186661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166681818307 - 2³ = 166681818299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166681812307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3839832 + ... + 3882997.

It is an arithmetic number, because the mean of its divisors is an integer number (21129662880).

Almost surely, 2^166681818307 is an apocalyptic number.

166681818307 is a deficient number, since it is larger than the sum of its proper divisors (2355484733).

166681818307 is a wasteful number, since it uses less digits than its factorization.

166681818307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7723133.

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

The spelling of 166681818307 in words is "one hundred sixty-six billion, six hundred eighty-one million, eight hundred eighteen thousand, three hundred seven".