201665356663 has 4 divisors (see below), whose sum is σ = 213528024720. Its totient is φ = 189802688608.

The previous prime is 201665356631. The next prime is 201665356703. The reversal of 201665356663 is 366653566102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201665356663 - 2⁵ = 201665356631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201665356063) 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, 5931334003 + ... + 5931334036.

It is an arithmetic number, because the mean of its divisors is an integer number (53382006180).

Almost surely, 2^201665356663 is an apocalyptic number.

201665356663 is a deficient number, since it is larger than the sum of its proper divisors (11862668057).

201665356663 is a wasteful number, since it uses less digits than its factorization.

201665356663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11862668056.

The product of its (nonzero) digits is 3499200, while the sum is 49.

The spelling of 201665356663 in words is "two hundred one billion, six hundred sixty-five million, three hundred fifty-six thousand, six hundred sixty-three".