2166323220563 has 2 divisors, whose sum is σ = 2166323220564. Its totient is φ = 2166323220562.

The previous prime is 2166323220517. The next prime is 2166323220569. The reversal of 2166323220563 is 3650223236612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2166323220563 - 2¹⁴ = 2166323204179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2166323220563.

It is not a weakly prime, because it can be changed into another prime (2166323220569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083161610281 + 1083161610282.

It is an arithmetic number, because the mean of its divisors is an integer number (1083161610282).

Almost surely, 2^{2166323220563} is an apocalyptic number.

2166323220563 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166323220563 is an equidigital number, since it uses as much as digits as its factorization.

2166323220563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 41.

The spelling of 2166323220563 in words is "two trillion, one hundred sixty-six billion, three hundred twenty-three million, two hundred twenty thousand, five hundred sixty-three".