2188378663 has 2 divisors, whose sum is σ = 2188378664. Its totient is φ = 2188378662.

The previous prime is 2188378651. The next prime is 2188378667. The reversal of 2188378663 is 3668738812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2188378663 - 2⁹ = 2188378151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2188378663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2188378667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094189331 + 1094189332.

It is an arithmetic number, because the mean of its divisors is an integer number (1094189332).

Almost surely, 2^2188378663 is an apocalyptic number.

2188378663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188378663 is an equidigital number, since it uses as much as digits as its factorization.

2188378663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 52.

The square root of 2188378663 is about 46780.1096941852. The cubic root of 2188378663 is about 1298.2973099088.

The spelling of 2188378663 in words is "two billion, one hundred eighty-eight million, three hundred seventy-eight thousand, six hundred sixty-three".