6488520649 has 12 divisors (see below), whose sum is σ = 7036091076. Its totient is φ = 5947916832.

The previous prime is 6488520629. The next prime is 6488520671. The reversal of 6488520649 is 9460258846.

It can be written as a sum of positive squares in 2 ways, for example, as 1401978249 + 5086542400 = 37443^2 + 71320^2 .

It is not a de Polignac number, because 6488520649 - 2⁵ = 6488520617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6488520596 and 6488520605.

It is not an unprimeable number, because it can be changed into a prime (6488520629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3638212 + ... + 3639994.

It is an arithmetic number, because the mean of its divisors is an integer number (586340923).

Almost surely, 2^6488520649 is an apocalyptic number.

It is an amenable number.

6488520649 is a deficient number, since it is larger than the sum of its proper divisors (547570427).

6488520649 is an equidigital number, since it uses as much as digits as its factorization.

6488520649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The square root of 6488520649 is about 80551.3541102817. The cubic root of 6488520649 is about 1865.1562949800.

The spelling of 6488520649 in words is "six billion, four hundred eighty-eight million, five hundred twenty thousand, six hundred forty-nine".