6520992449 has 2 divisors, whose sum is σ = 6520992450. Its totient is φ = 6520992448.

The previous prime is 6520992433. The next prime is 6520992509. The reversal of 6520992449 is 9442990256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6247321600 + 273670849 = 79040^2 + 16543^2 .

It is a cyclic number.

It is not a de Polignac number, because 6520992449 - 2⁴ = 6520992433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6520992397 and 6520992406.

It is not a weakly prime, because it can be changed into another prime (6520992749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260496224 + 3260496225.

It is an arithmetic number, because the mean of its divisors is an integer number (3260496225).

Almost surely, 2^6520992449 is an apocalyptic number.

It is an amenable number.

6520992449 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520992449 is an equidigital number, since it uses as much as digits as its factorization.

6520992449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 6520992449 is about 80752.6621790266. The cubic root of 6520992449 is about 1868.2625104507.

The spelling of 6520992449 in words is "six billion, five hundred twenty million, nine hundred ninety-two thousand, four hundred forty-nine".