16663445653 has 4 divisors (see below), whose sum is σ = 16706953728. Its totient is φ = 16619937580.

The previous prime is 16663445647. The next prime is 16663445671. The reversal of 16663445653 is 35654436661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35654436661 = 73907 ⋅482423.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16663445653 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16663445597 and 16663445606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16663445693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21753463 + ... + 21754228.

It is an arithmetic number, because the mean of its divisors is an integer number (4176738432).

Almost surely, 2^16663445653 is an apocalyptic number.

It is an amenable number.

16663445653 is a deficient number, since it is larger than the sum of its proper divisors (43508075).

16663445653 is an equidigital number, since it uses as much as digits as its factorization.

16663445653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43508074.

The product of its digits is 4665600, while the sum is 49.

The spelling of 16663445653 in words is "sixteen billion, six hundred sixty-three million, four hundred forty-five thousand, six hundred fifty-three".