16544435664643 has 16 divisors (see below), whose sum is σ = 17255363829760. Its totient is φ = 15844607251200.

The previous prime is 16544435664587. The next prime is 16544435664697. The reversal of 16544435664643 is 34646653444561.

It is a happy number.

16544435664643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16544435664643 - 2⁹ = 16544435664131 is a prime.

It is a super-2 number, since 2×16544435664643² (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 (16544435604643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45920878 + ... + 46279756.

It is an arithmetic number, because the mean of its divisors is an integer number (1078460239360).

Almost surely, 2^{16544435664643} is an apocalyptic number.

16544435664643 is a deficient number, since it is larger than the sum of its proper divisors (710928165117).

16544435664643 is a wasteful number, since it uses less digits than its factorization.

16544435664643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374338.

The product of its digits is 298598400, while the sum is 61.

The spelling of 16544435664643 in words is "sixteen trillion, five hundred forty-four billion, four hundred thirty-five million, six hundred sixty-four thousand, six hundred forty-three".