201609668 has 48 divisors (see below), whose sum is σ = 390168576. Its totient is φ = 90579840.

The previous prime is 201609641. The next prime is 201609673. The reversal of 201609668 is 866906102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526205 + ... + 526587.

It is an arithmetic number, because the mean of its divisors is an integer number (8128512).

Almost surely, 2^201609668 is an apocalyptic number.

It is an amenable number.

201609668 is a deficient number, since it is larger than the sum of its proper divisors (188558908).

201609668 is a wasteful number, since it uses less digits than its factorization.

201609668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 201609668 is about 14198.9319316630. The cubic root of 201609668 is about 586.3682566119.

The spelling of 201609668 in words is "two hundred one million, six hundred nine thousand, six hundred sixty-eight".