16563966911813 has 2 divisors, whose sum is σ = 16563966911814. Its totient is φ = 16563966911812.

The previous prime is 16563966911783. The next prime is 16563966911861. The reversal of 16563966911813 is 31811966936561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13152938383204 + 3411028528609 = 3626698^2 + 1846897^2 .

It is a cyclic number.

It is not a de Polignac number, because 16563966911813 - 2¹⁰ = 16563966910789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16563966911813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16563966911873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8281983455906 + 8281983455907.

It is an arithmetic number, because the mean of its divisors is an integer number (8281983455907).

Almost surely, 2^{16563966911813} is an apocalyptic number.

It is an amenable number.

16563966911813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16563966911813 is an equidigital number, since it uses as much as digits as its factorization.

16563966911813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37791360, while the sum is 65.

The spelling of 16563966911813 in words is "sixteen trillion, five hundred sixty-three billion, nine hundred sixty-six million, nine hundred eleven thousand, eight hundred thirteen".