189508666 has 8 divisors (see below), whose sum is σ = 284321664. Its totient is φ = 94734780.

The previous prime is 189508643. The next prime is 189508687. The reversal of 189508666 is 666805981.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12381 + ... + 23071.

It is an arithmetic number, because the mean of its divisors is an integer number (35540208).

Almost surely, 2^189508666 is an apocalyptic number.

189508666 is a deficient number, since it is larger than the sum of its proper divisors (94812998).

189508666 is a wasteful number, since it uses less digits than its factorization.

189508666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19556.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 189508666 is about 13766.2146576319. The cubic root of 189508666 is about 574.3937312451.

The spelling of 189508666 in words is "one hundred eighty-nine million, five hundred eight thousand, six hundred sixty-six".