166985090 has 8 divisors (see below), whose sum is σ = 300573180. Its totient is φ = 66794032.

The previous prime is 166985089. The next prime is 166985111. The reversal of 166985090 is 90589661.

It can be written as a sum of positive squares in 2 ways, for example, as 164891281 + 2093809 = 12841^2 + 1447^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8349245 + ... + 8349264.

Almost surely, 2^166985090 is an apocalyptic number.

166985090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166985090 is a deficient number, since it is larger than the sum of its proper divisors (133588090).

166985090 is a wasteful number, since it uses less digits than its factorization.

166985090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16698516.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 166985090 is about 12922.2710852234. The cubic root of 166985090 is about 550.6714554169.

The spelling of 166985090 in words is "one hundred sixty-six million, nine hundred eighty-five thousand, ninety".