201665768 has 16 divisors (see below), whose sum is σ = 391162500. Its totient is φ = 97355776.

The previous prime is 201665741. The next prime is 201665801. The reversal of 201665768 is 867566102.

It can be written as a sum of positive squares in 2 ways, for example, as 174187204 + 27478564 = 13198^2 + 5242^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 434393 + ... + 434856.

Almost surely, 2^201665768 is an apocalyptic number.

It is an amenable number.

201665768 is a deficient number, since it is larger than the sum of its proper divisors (189496732).

201665768 is a wasteful number, since it uses less digits than its factorization.

201665768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869284 (or 869280 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 201665768 is about 14200.9072949583. The cubic root of 201665768 is about 586.4226392693.

The spelling of 201665768 in words is "two hundred one million, six hundred sixty-five thousand, seven hundred sixty-eight".