166664839 has 8 divisors (see below), whose sum is σ = 181914768. Its totient is φ = 151431360.

The previous prime is 166664819. The next prime is 166664843. The reversal of 166664839 is 938466661.

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 166664839 - 2¹¹ = 166662791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166664792 and 166664801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166664809) 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, 28059 + ... + 33475.

It is an arithmetic number, because the mean of its divisors is an integer number (22739346).

Almost surely, 2^166664839 is an apocalyptic number.

166664839 is a deficient number, since it is larger than the sum of its proper divisors (15249929).

166664839 is a wasteful number, since it uses less digits than its factorization.

166664839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8225.

The product of its digits is 1119744, while the sum is 49.

The square root of 166664839 is about 12909.8737019384. The cubic root of 166664839 is about 550.3191965343.

The spelling of 166664839 in words is "one hundred sixty-six million, six hundred sixty-four thousand, eight hundred thirty-nine".