6779571217 has 2 divisors, whose sum is σ = 6779571218. Its totient is φ = 6779571216.

The previous prime is 6779571079. The next prime is 6779571269. The reversal of 6779571217 is 7121759776.

It is an a-pointer prime, because the next prime (6779571269) can be obtained adding 6779571217 to its sum of digits (52).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6743858641 + 35712576 = 82121^2 + 5976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6779571217 is a prime.

It is a super-2 number, since 2×6779571217² = 91925171772749722178, which contains 22 as substring.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389785608 + 3389785609.

It is an arithmetic number, because the mean of its divisors is an integer number (3389785609).

Almost surely, 2^6779571217 is an apocalyptic number.

It is an amenable number.

6779571217 is a deficient number, since it is larger than the sum of its proper divisors (1).

6779571217 is an equidigital number, since it uses as much as digits as its factorization.

6779571217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296540, while the sum is 52.

The square root of 6779571217 is about 82338.1516491596. The cubic root of 6779571217 is about 1892.6373617728.

The spelling of 6779571217 in words is "six billion, seven hundred seventy-nine million, five hundred seventy-one thousand, two hundred seventeen".