6725566217 has 2 divisors, whose sum is σ = 6725566218. Its totient is φ = 6725566216.

The previous prime is 6725566207. The next prime is 6725566247. The reversal of 6725566217 is 7126655276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3520760896 + 3204805321 = 59336^2 + 56611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6725566217 is a prime.

It is not a weakly prime, because it can be changed into another prime (6725566207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3362783108 + 3362783109.

It is an arithmetic number, because the mean of its divisors is an integer number (3362783109).

Almost surely, 2^6725566217 is an apocalyptic number.

It is an amenable number.

6725566217 is a deficient number, since it is larger than the sum of its proper divisors (1).

6725566217 is an equidigital number, since it uses as much as digits as its factorization.

6725566217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 47.

The square root of 6725566217 is about 82009.5495475984. The cubic root of 6725566217 is about 1887.5984742974.

The spelling of 6725566217 in words is "six billion, seven hundred twenty-five million, five hundred sixty-six thousand, two hundred seventeen".