166197839 has 8 divisors (see below), whose sum is σ = 173709792. Its totient is φ = 158709760.

The previous prime is 166197833. The next prime is 166197847. The reversal of 166197839 is 938791661.

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 166197839 - 2⁸ = 166197583 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 (166197833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9107 + ... + 20379.

It is an arithmetic number, because the mean of its divisors is an integer number (21713724).

Almost surely, 2^166197839 is an apocalyptic number.

166197839 is a deficient number, since it is larger than the sum of its proper divisors (7511953).

166197839 is a wasteful number, since it uses less digits than its factorization.

166197839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11937.

The product of its digits is 489888, while the sum is 50.

The square root of 166197839 is about 12891.7740827242. The cubic root of 166197839 is about 549.8047119346.

The spelling of 166197839 in words is "one hundred sixty-six million, one hundred ninety-seven thousand, eight hundred thirty-nine".