6681761543 has 2 divisors, whose sum is σ = 6681761544. Its totient is φ = 6681761542.

The previous prime is 6681761497. The next prime is 6681761551. The reversal of 6681761543 is 3451671866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6681761543 - 2²⁰ = 6680712967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6681761563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340880771 + 3340880772.

It is an arithmetic number, because the mean of its divisors is an integer number (3340880772).

Almost surely, 2^6681761543 is an apocalyptic number.

6681761543 is a deficient number, since it is larger than the sum of its proper divisors (1).

6681761543 is an equidigital number, since it uses as much as digits as its factorization.

6681761543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 6681761543 is about 81742.0426891817. The cubic root of 6681761543 is about 1883.4914692565.

The spelling of 6681761543 in words is "six billion, six hundred eighty-one million, seven hundred sixty-one thousand, five hundred forty-three".