16644222086681 has 24 divisors (see below), whose sum is σ = 19847104548480. Its totient is φ = 13911026694432.

The previous prime is 16644222086669. The next prime is 16644222086693. The reversal of 16644222086681 is 18668022244661.

It is an interprime number because it is at equal distance from previous prime (16644222086669) and next prime (16644222086693).

It is not a de Polignac number, because 16644222086681 - 2¹⁰ = 16644222085657 is a prime.

It is a super-2 number, since 2×16644222086681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16644222086381) 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 23 ways as a sum of consecutive naturals, for example, 12813935 + ... + 14052948.

It is an arithmetic number, because the mean of its divisors is an integer number (826962689520).

Almost surely, 2^{16644222086681} is an apocalyptic number.

It is an amenable number.

16644222086681 is a deficient number, since it is larger than the sum of its proper divisors (3202882461799).

16644222086681 is a wasteful number, since it uses less digits than its factorization.

16644222086681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26867213 (or 26867206 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 56.

The spelling of 16644222086681 in words is "sixteen trillion, six hundred forty-four billion, two hundred twenty-two million, eighty-six thousand, six hundred eighty-one".