6540743687 has 2 divisors, whose sum is σ = 6540743688. Its totient is φ = 6540743686.

The previous prime is 6540743669. The next prime is 6540743689. The reversal of 6540743687 is 7863470456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6540743687 - 2⁶ = 6540743623 is a prime.

Together with 6540743689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6540743689) 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, 3270371843 + 3270371844.

It is an arithmetic number, because the mean of its divisors is an integer number (3270371844).

Almost surely, 2^6540743687 is an apocalyptic number.

6540743687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6540743687 is an equidigital number, since it uses as much as digits as its factorization.

6540743687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 50.

The square root of 6540743687 is about 80874.8643708291. The cubic root of 6540743687 is about 1870.1468506407.

The spelling of 6540743687 in words is "six billion, five hundred forty million, seven hundred forty-three thousand, six hundred eighty-seven".