166889998 has 8 divisors (see below), whose sum is σ = 273092760. Its totient is φ = 75859080.

The previous prime is 166889993. The next prime is 166890023. The reversal of 166889998 is 899988661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166889993) 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 3 ways as a sum of consecutive naturals, for example, 3792933 + ... + 3792976.

It is an arithmetic number, because the mean of its divisors is an integer number (34136595).

Almost surely, 2^166889998 is an apocalyptic number.

166889998 is a deficient number, since it is larger than the sum of its proper divisors (106202762).

166889998 is a wasteful number, since it uses less digits than its factorization.

166889998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7585922.

The product of its digits is 13436928, while the sum is 64.

The square root of 166889998 is about 12918.5911770595. The cubic root of 166889998 is about 550.5669063759.

The spelling of 166889998 in words is "one hundred sixty-six million, eight hundred eighty-nine thousand, nine hundred ninety-eight".