6781375663 has 2 divisors, whose sum is σ = 6781375664. Its totient is φ = 6781375662.

The previous prime is 6781375607. The next prime is 6781375669. The reversal of 6781375663 is 3665731876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6781375663 - 2⁹ = 6781375151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6781375663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6781375669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390687831 + 3390687832.

It is an arithmetic number, because the mean of its divisors is an integer number (3390687832).

Almost surely, 2^6781375663 is an apocalyptic number.

6781375663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781375663 is an equidigital number, since it uses as much as digits as its factorization.

6781375663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 52.

The square root of 6781375663 is about 82349.1084529760. The cubic root of 6781375663 is about 1892.8052612294.

The spelling of 6781375663 in words is "six billion, seven hundred eighty-one million, three hundred seventy-five thousand, six hundred sixty-three".