2166302563549 has 2 divisors, whose sum is σ = 2166302563550. Its totient is φ = 2166302563548.

The previous prime is 2166302563511. The next prime is 2166302563553. The reversal of 2166302563549 is 9453652036612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1753055440900 + 413247122649 = 1324030^2 + 642843^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166302563549 - 2⁹ = 2166302563037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166302563496 and 2166302563505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166302563589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083151281774 + 1083151281775.

It is an arithmetic number, because the mean of its divisors is an integer number (1083151281775).

Almost surely, 2^{2166302563549} is an apocalyptic number.

It is an amenable number.

2166302563549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166302563549 is an equidigital number, since it uses as much as digits as its factorization.

2166302563549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6998400, while the sum is 52.

The spelling of 2166302563549 in words is "two trillion, one hundred sixty-six billion, three hundred two million, five hundred sixty-three thousand, five hundred forty-nine".