6778745287 has 2 divisors, whose sum is σ = 6778745288. Its totient is φ = 6778745286.

The previous prime is 6778745279. The next prime is 6778745297. The reversal of 6778745287 is 7825478776.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6778745287 - 2³ = 6778745279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6778745297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389372643 + 3389372644.

It is an arithmetic number, because the mean of its divisors is an integer number (3389372644).

Almost surely, 2^6778745287 is an apocalyptic number.

6778745287 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778745287 is an equidigital number, since it uses as much as digits as its factorization.

6778745287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36879360, while the sum is 61.

The square root of 6778745287 is about 82333.1360206812. The cubic root of 6778745287 is about 1892.5605009897.

The spelling of 6778745287 in words is "six billion, seven hundred seventy-eight million, seven hundred forty-five thousand, two hundred eighty-seven".