6515666197 has 2 divisors, whose sum is σ = 6515666198. Its totient is φ = 6515666196.

The previous prime is 6515666137. The next prime is 6515666221. The reversal of 6515666197 is 7916665156.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5136732241 + 1378933956 = 71671^2 + 37134^2 .

It is a cyclic number.

It is not a de Polignac number, because 6515666197 - 2¹¹ = 6515664149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6515666137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3257833098 + 3257833099.

It is an arithmetic number, because the mean of its divisors is an integer number (3257833099).

Almost surely, 2^6515666197 is an apocalyptic number.

It is an amenable number.

6515666197 is a deficient number, since it is larger than the sum of its proper divisors (1).

6515666197 is an equidigital number, since it uses as much as digits as its factorization.

6515666197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 52.

The square root of 6515666197 is about 80719.6766408290. The cubic root of 6515666197 is about 1867.7537153312.

The spelling of 6515666197 in words is "six billion, five hundred fifteen million, six hundred sixty-six thousand, one hundred ninety-seven".