6820779331 has 2 divisors, whose sum is σ = 6820779332. Its totient is φ = 6820779330.

The previous prime is 6820779281. The next prime is 6820779367. The reversal of 6820779331 is 1339770286.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6820779331 is a prime.

It is a super-2 number, since 2×6820779331² = 93046061364393615122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6820779431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410389665 + 3410389666.

It is an arithmetic number, because the mean of its divisors is an integer number (3410389666).

Almost surely, 2^6820779331 is an apocalyptic number.

6820779331 is a deficient number, since it is larger than the sum of its proper divisors (1).

6820779331 is an equidigital number, since it uses as much as digits as its factorization.

6820779331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 6820779331 is about 82588.0096079328. The cubic root of 6820779331 is about 1896.4642767840.

The spelling of 6820779331 in words is "six billion, eight hundred twenty million, seven hundred seventy-nine thousand, three hundred thirty-one".