16440873643 has 2 divisors, whose sum is σ = 16440873644. Its totient is φ = 16440873642.

The previous prime is 16440873611. The next prime is 16440873661. The reversal of 16440873643 is 34637804461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16440873643 - 2⁵ = 16440873611 is a prime.

It is a super-3 number, since 3×16440873643³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 16440873593 and 16440873602.

It is not a weakly prime, because it can be changed into another prime (16440873443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8220436821 + 8220436822.

It is an arithmetic number, because the mean of its divisors is an integer number (8220436822).

Almost surely, 2^16440873643 is an apocalyptic number.

16440873643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16440873643 is an equidigital number, since it uses as much as digits as its factorization.

16440873643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 16440873643 in words is "sixteen billion, four hundred forty million, eight hundred seventy-three thousand, six hundred forty-three".