201989166 has 16 divisors (see below), whose sum is σ = 404475600. Its totient is φ = 67246848.

The previous prime is 201989153. The next prime is 201989167. The reversal of 201989166 is 661989102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201989167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15331 + ... + 25278.

It is an arithmetic number, because the mean of its divisors is an integer number (25279725).

Almost surely, 2^201989166 is an apocalyptic number.

201989166 is an abundant number, since it is smaller than the sum of its proper divisors (202486434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201989166 is a wasteful number, since it uses less digits than its factorization.

201989166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41443.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 201989166 is about 14212.2892596513. The cubic root of 201989166 is about 586.7359408699.

The spelling of 201989166 in words is "two hundred one million, nine hundred eighty-nine thousand, one hundred sixty-six".