163990666 has 8 divisors (see below), whose sum is σ = 281126880. Its totient is φ = 70281708.

The previous prime is 163990657. The next prime is 163990669. The reversal of 163990666 is 666099361.

163990666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (163990669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5856796 + ... + 5856823.

It is an arithmetic number, because the mean of its divisors is an integer number (35140860).

Almost surely, 2^163990666 is an apocalyptic number.

163990666 is a deficient number, since it is larger than the sum of its proper divisors (117136214).

163990666 is a wasteful number, since it uses less digits than its factorization.

163990666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11713628.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 163990666 is about 12805.8840382068. The cubic root of 163990666 is about 547.3599828214.

The spelling of 163990666 in words is "one hundred sixty-three million, nine hundred ninety thousand, six hundred sixty-six".