16564577117779 has 2 divisors, whose sum is σ = 16564577117780. Its totient is φ = 16564577117778.

The previous prime is 16564577117749. The next prime is 16564577117789. The reversal of 16564577117779 is 97771177546561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16564577117779 - 2⁷ = 16564577117651 is a prime.

It is not a weakly prime, because it can be changed into another prime (16564577117749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282288558889 + 8282288558890.

It is an arithmetic number, because the mean of its divisors is an integer number (8282288558890).

Almost surely, 2^{16564577117779} is an apocalyptic number.

16564577117779 is a deficient number, since it is larger than the sum of its proper divisors (1).

16564577117779 is an equidigital number, since it uses as much as digits as its factorization.

16564577117779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544546800, while the sum is 73.

The spelling of 16564577117779 in words is "sixteen trillion, five hundred sixty-four billion, five hundred seventy-seven million, one hundred seventeen thousand, seven hundred seventy-nine".