166678889 has 8 divisors (see below), whose sum is σ = 179699520. Its totient is φ = 153686736.

The previous prime is 166678871. The next prime is 166678913. The reversal of 166678889 is 988876661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166678889 is a prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (166678189) 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, 5942 + ... + 19200.

It is an arithmetic number, because the mean of its divisors is an integer number (22462440).

Almost surely, 2^166678889 is an apocalyptic number.

It is an amenable number.

166678889 is a deficient number, since it is larger than the sum of its proper divisors (13020631).

166678889 is a wasteful number, since it uses less digits than its factorization.

166678889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14239.

The product of its digits is 6967296, while the sum is 59.

The square root of 166678889 is about 12910.4178476144. The cubic root of 166678889 is about 550.3346602388.

The spelling of 166678889 in words is "one hundred sixty-six million, six hundred seventy-eight thousand, eight hundred eighty-nine".