16506444613663 has 4 divisors (see below), whose sum is σ = 16777042066408. Its totient is φ = 16235847160920.

The previous prime is 16506444613661. The next prime is 16506444613679. The reversal of 16506444613663 is 36631644460561.

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 16506444613663 - 2¹ = 16506444613661 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 (16506444613661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135298726281 + ... + 135298726402.

It is an arithmetic number, because the mean of its divisors is an integer number (4194260516602).

Almost surely, 2^{16506444613663} is an apocalyptic number.

16506444613663 is a deficient number, since it is larger than the sum of its proper divisors (270597452745).

16506444613663 is an equidigital number, since it uses as much as digits as its factorization.

16506444613663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270597452744.

The product of its (nonzero) digits is 22394880, while the sum is 55.

The spelling of 16506444613663 in words is "sixteen trillion, five hundred six billion, four hundred forty-four million, six hundred thirteen thousand, six hundred sixty-three".