201661663 has 8 divisors (see below), whose sum is σ = 232585760. Its totient is φ = 171266400.

The previous prime is 201661651. The next prime is 201661673. The reversal of 201661663 is 366166102.

201661663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201661663 - 2⁹ = 201661151 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 (201661613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131388 + ... + 132913.

It is an arithmetic number, because the mean of its divisors is an integer number (29073220).

Almost surely, 2^201661663 is an apocalyptic number.

201661663 is a deficient number, since it is larger than the sum of its proper divisors (30924097).

201661663 is a wasteful number, since it uses less digits than its factorization.

201661663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264417.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 201661663 is about 14200.7627612041. The cubic root of 201661663 is about 586.4186602743.

The spelling of 201661663 in words is "two hundred one million, six hundred sixty-one thousand, six hundred sixty-three".