201663444026881 has 8 divisors (see below), whose sum is σ = 224764210061280. Its totient is φ = 179811368048448.

The previous prime is 201663444026857. The next prime is 201663444026893. The reversal of 201663444026881 is 188620444366102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201663444026881 is a prime.

It is a super-2 number, since 2×201663444026881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201663444026851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312172513651 + ... + 312172514296.

It is an arithmetic number, because the mean of its divisors is an integer number (28095526257660).

Almost surely, 2^{201663444026881} is an apocalyptic number.

It is an amenable number.

201663444026881 is a deficient number, since it is larger than the sum of its proper divisors (23100766034399).

201663444026881 is a wasteful number, since it uses less digits than its factorization.

201663444026881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624345027983.

The product of its (nonzero) digits is 10616832, while the sum is 55.

The spelling of 201663444026881 in words is "two hundred one trillion, six hundred sixty-three billion, four hundred forty-four million, twenty-six thousand, eight hundred eighty-one".