6691359377 has 2 divisors, whose sum is σ = 6691359378. Its totient is φ = 6691359376.

The previous prime is 6691359359. The next prime is 6691359379. The reversal of 6691359377 is 7739531966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6424984336 + 266375041 = 80156^2 + 16321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6691359377 is a prime.

Together with 6691359379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6691359379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345679688 + 3345679689.

It is an arithmetic number, because the mean of its divisors is an integer number (3345679689).

Almost surely, 2^6691359377 is an apocalyptic number.

It is an amenable number.

6691359377 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691359377 is an equidigital number, since it uses as much as digits as its factorization.

6691359377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6429780, while the sum is 56.

The square root of 6691359377 is about 81800.7296850095. The cubic root of 6691359377 is about 1884.3928677691.

The spelling of 6691359377 in words is "six billion, six hundred ninety-one million, three hundred fifty-nine thousand, three hundred seventy-seven".