6646727137 has 2 divisors, whose sum is σ = 6646727138. Its totient is φ = 6646727136.

The previous prime is 6646727119. The next prime is 6646727141. The reversal of 6646727137 is 7317276466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6640457121 + 6270016 = 81489^2 + 2504^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6646727137 is a prime.

It is not a weakly prime, because it can be changed into another prime (6646724137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323363568 + 3323363569.

It is an arithmetic number, because the mean of its divisors is an integer number (3323363569).

Almost surely, 2^6646727137 is an apocalyptic number.

It is an amenable number.

6646727137 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646727137 is an equidigital number, since it uses as much as digits as its factorization.

6646727137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 49.

The square root of 6646727137 is about 81527.4624712434. The cubic root of 6646727137 is about 1880.1938023576.

The spelling of 6646727137 in words is "six billion, six hundred forty-six million, seven hundred twenty-seven thousand, one hundred thirty-seven".