6718135639 has 2 divisors, whose sum is σ = 6718135640. Its totient is φ = 6718135638.

The previous prime is 6718135637. The next prime is 6718135709. The reversal of 6718135639 is 9365318176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6718135639 - 2¹ = 6718135637 is a prime.

Together with 6718135637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6718135592 and 6718135601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6718135637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3359067819 + 3359067820.

It is an arithmetic number, because the mean of its divisors is an integer number (3359067820).

Almost surely, 2^6718135639 is an apocalyptic number.

6718135639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6718135639 is an equidigital number, since it uses as much as digits as its factorization.

6718135639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 6718135639 is about 81964.2339011352. The cubic root of 6718135639 is about 1886.9030624008.

The spelling of 6718135639 in words is "six billion, seven hundred eighteen million, one hundred thirty-five thousand, six hundred thirty-nine".