6606518521 has 2 divisors, whose sum is σ = 6606518522. Its totient is φ = 6606518520.

The previous prime is 6606518453. The next prime is 6606518539. The reversal of 6606518521 is 1258156066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6603350121 + 3168400 = 81261^2 + 1780^2 .

It is a cyclic number.

It is not a de Polignac number, because 6606518521 - 2¹⁷ = 6606387449 is a prime.

It is not a weakly prime, because it can be changed into another prime (6606518591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3303259260 + 3303259261.

It is an arithmetic number, because the mean of its divisors is an integer number (3303259261).

Almost surely, 2^6606518521 is an apocalyptic number.

It is an amenable number.

6606518521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6606518521 is an equidigital number, since it uses as much as digits as its factorization.

6606518521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 6606518521 is about 81280.4928688305. The cubic root of 6606518521 is about 1876.3947923110.

The spelling of 6606518521 in words is "six billion, six hundred six million, five hundred eighteen thousand, five hundred twenty-one".