6878781947 has 2 divisors, whose sum is σ = 6878781948. Its totient is φ = 6878781946.

The previous prime is 6878781863. The next prime is 6878781977. The reversal of 6878781947 is 7491878786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6878781947 - 2⁸ = 6878781691 is a prime.

It is a super-2 number, since 2×6878781947² = 94635282148746221618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6878781977) 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, 3439390973 + 3439390974.

It is an arithmetic number, because the mean of its divisors is an integer number (3439390974).

Almost surely, 2^6878781947 is an apocalyptic number.

6878781947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6878781947 is an equidigital number, since it uses as much as digits as its factorization.

6878781947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37933056, while the sum is 65.

The square root of 6878781947 is about 82938.4226218464. The cubic root of 6878781947 is about 1901.8248346999.

The spelling of 6878781947 in words is "six billion, eight hundred seventy-eight million, seven hundred eighty-one thousand, nine hundred forty-seven".