201665656 has 32 divisors (see below), whose sum is σ = 395604000. Its totient is φ = 96194560.

The previous prime is 201665647. The next prime is 201665671. The reversal of 201665656 is 656566102.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 81396 + ... + 83836.

It is an arithmetic number, because the mean of its divisors is an integer number (12362625).

Almost surely, 2^201665656 is an apocalyptic number.

It is an amenable number.

201665656 is a deficient number, since it is larger than the sum of its proper divisors (193938344).

201665656 is a wasteful number, since it uses less digits than its factorization.

201665656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919 (or 2915 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 201665656 is about 14200.9033515477. The cubic root of 201665656 is about 586.4225307079.

The spelling of 201665656 in words is "two hundred one million, six hundred sixty-five thousand, six hundred fifty-six".