166389889 has 8 divisors (see below), whose sum is σ = 174408192. Its totient is φ = 158436960.

The previous prime is 166389887. The next prime is 166389913. The reversal of 166389889 is 988983661.

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 166389889 - 2¹ = 166389887 is a prime.

It is a super-2 number, since 2×166389889² = 55371190322864642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166389887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11092 + ... + 21349.

It is an arithmetic number, because the mean of its divisors is an integer number (21801024).

Almost surely, 2^166389889 is an apocalyptic number.

It is an amenable number.

166389889 is a deficient number, since it is larger than the sum of its proper divisors (8018303).

166389889 is a wasteful number, since it uses less digits than its factorization.

166389889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32687.

The product of its digits is 4478976, while the sum is 58.

The square root of 166389889 is about 12899.2204803236. The cubic root of 166389889 is about 550.0164061222.

The spelling of 166389889 in words is "one hundred sixty-six million, three hundred eighty-nine thousand, eight hundred eighty-nine".