16441649281 has 4 divisors (see below), whose sum is σ = 16463255364. Its totient is φ = 16420043200.

The previous prime is 16441649261. The next prime is 16441649293. The reversal of 16441649281 is 18294614461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18294614461 = 73 ⋅250611157.

It can be written as a sum of positive squares in 2 ways, for example, as 1522248256 + 14919401025 = 39016^2 + 122145^2 .

It is a cyclic number.

It is not a de Polignac number, because 16441649281 - 2⁵ = 16441649249 is a prime.

It is a super-3 number, since 3×16441649281³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16441649201) 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, 10801900 + ... + 10803421.

It is an arithmetic number, because the mean of its divisors is an integer number (4115813841).

Almost surely, 2^16441649281 is an apocalyptic number.

It is an amenable number.

16441649281 is a deficient number, since it is larger than the sum of its proper divisors (21606083).

16441649281 is an equidigital number, since it uses as much as digits as its factorization.

16441649281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21606082.

The product of its digits is 331776, while the sum is 46.

The spelling of 16441649281 in words is "sixteen billion, four hundred forty-one million, six hundred forty-nine thousand, two hundred eighty-one".