6878711857 has 2 divisors, whose sum is σ = 6878711858. Its totient is φ = 6878711856.

The previous prime is 6878711839. The next prime is 6878711863. The reversal of 6878711857 is 7581178786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6857330481 + 21381376 = 82809^2 + 4624^2 .

It is a cyclic number.

It is not a de Polignac number, because 6878711857 - 2²³ = 6870323249 is a prime.

It is a super-3 number, since 3×6878711857³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6878711897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3439355928 + 3439355929.

It is an arithmetic number, because the mean of its divisors is an integer number (3439355929).

Almost surely, 2^6878711857 is an apocalyptic number.

It is an amenable number.

6878711857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6878711857 is an equidigital number, since it uses as much as digits as its factorization.

6878711857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5268480, while the sum is 58.

The square root of 6878711857 is about 82938.0000783718. Note that the first 4 decimals coincide. The cubic root of 6878711857 is about 1901.8183752542.

The spelling of 6878711857 in words is "six billion, eight hundred seventy-eight million, seven hundred eleven thousand, eight hundred fifty-seven".