6504187649 has 2 divisors, whose sum is σ = 6504187650. Its totient is φ = 6504187648.

The previous prime is 6504187619. The next prime is 6504187721. The reversal of 6504187649 is 9467814056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6278977600 + 225210049 = 79240^2 + 15007^2 .

It is a cyclic number.

It is not a de Polignac number, because 6504187649 - 2³² = 2209220353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6504187597 and 6504187606.

It is not a weakly prime, because it can be changed into another prime (6504187619) 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, 3252093824 + 3252093825.

It is an arithmetic number, because the mean of its divisors is an integer number (3252093825).

Almost surely, 2^6504187649 is an apocalyptic number.

It is an amenable number.

6504187649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6504187649 is an equidigital number, since it uses as much as digits as its factorization.

6504187649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 6504187649 is about 80648.5439980165. The cubic root of 6504187649 is about 1866.6562730537.

The spelling of 6504187649 in words is "six billion, five hundred four million, one hundred eighty-seven thousand, six hundred forty-nine".