201881663 has 4 divisors (see below), whose sum is σ = 206805648. Its totient is φ = 196957680.

The previous prime is 201881651. The next prime is 201881671. The reversal of 201881663 is 366188102.

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 201881663 - 2⁶ = 201881599 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 (201881623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2461931 + ... + 2462012.

It is an arithmetic number, because the mean of its divisors is an integer number (51701412).

Almost surely, 2^201881663 is an apocalyptic number.

201881663 is a deficient number, since it is larger than the sum of its proper divisors (4923985).

201881663 is an equidigital number, since it uses as much as digits as its factorization.

201881663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4923984.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 201881663 is about 14208.5067125296. The cubic root of 201881663 is about 586.6318312147.

The spelling of 201881663 in words is "two hundred one million, eight hundred eighty-one thousand, six hundred sixty-three".