2116561663 has 2 divisors, whose sum is σ = 2116561664. Its totient is φ = 2116561662.

The previous prime is 2116561633. The next prime is 2116561679. The reversal of 2116561663 is 3661656112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2116561663 - 2¹³ = 2116553471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2116561613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058280831 + 1058280832.

It is an arithmetic number, because the mean of its divisors is an integer number (1058280832).

Almost surely, 2^2116561663 is an apocalyptic number.

2116561663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116561663 is an equidigital number, since it uses as much as digits as its factorization.

2116561663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 2116561663 is about 46006.1046275383. The cubic root of 2116561663 is about 1283.9367856014.

It can be divided in two parts, 21165 and 61663, that added together give a palindrome (82828).

The spelling of 2116561663 in words is "two billion, one hundred sixteen million, five hundred sixty-one thousand, six hundred sixty-three".