6517678771 has 2 divisors, whose sum is σ = 6517678772. Its totient is φ = 6517678770.

The previous prime is 6517678721. The next prime is 6517678781. The reversal of 6517678771 is 1778767156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6517678771 - 2²⁷ = 6383461043 is a prime.

It is not a weakly prime, because it can be changed into another prime (6517678711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258839385 + 3258839386.

It is an arithmetic number, because the mean of its divisors is an integer number (3258839386).

Almost surely, 2^6517678771 is an apocalyptic number.

6517678771 is a deficient number, since it is larger than the sum of its proper divisors (1).

6517678771 is an equidigital number, since it uses as much as digits as its factorization.

6517678771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3457440, while the sum is 55.

The square root of 6517678771 is about 80732.1421182419. The cubic root of 6517678771 is about 1867.9460008929.

The spelling of 6517678771 in words is "six billion, five hundred seventeen million, six hundred seventy-eight thousand, seven hundred seventy-one".