16663541644423 has 32 divisors (see below), whose sum is σ = 17699131183104. Its totient is φ = 15665732640000.

The previous prime is 16663541644417. The next prime is 16663541644433. The reversal of 16663541644423 is 32444614536661.

It is a cyclic number.

It is not a de Polignac number, because 16663541644423 - 2³³ = 16654951709831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16663541644433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 576160003 + ... + 576188923.

It is an arithmetic number, because the mean of its divisors is an integer number (553097849472).

Almost surely, 2^{16663541644423} is an apocalyptic number.

16663541644423 is a deficient number, since it is larger than the sum of its proper divisors (1035589538681).

16663541644423 is a wasteful number, since it uses less digits than its factorization.

16663541644423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32767.

The product of its digits is 29859840, while the sum is 55.

The spelling of 16663541644423 in words is "sixteen trillion, six hundred sixty-three billion, five hundred forty-one million, six hundred forty-four thousand, four hundred twenty-three".