6508447997 has 4 divisors (see below), whose sum is σ = 6511873596. Its totient is φ = 6505022400.

The previous prime is 6508447993. The next prime is 6508448003. The reversal of 6508447997 is 7997448056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3108508516 + 3399939481 = 55754^2 + 58309^2 .

It is a cyclic number.

It is not a de Polignac number, because 6508447997 - 2² = 6508447993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6508447993) 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 in 3 ways as a sum of consecutive naturals, for example, 1709948 + ... + 1713749.

It is an arithmetic number, because the mean of its divisors is an integer number (1627968399).

Almost surely, 2^6508447997 is an apocalyptic number.

It is an amenable number.

6508447997 is a deficient number, since it is larger than the sum of its proper divisors (3425599).

6508447997 is a wasteful number, since it uses less digits than its factorization.

6508447997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425598.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The square root of 6508447997 is about 80674.9527238783. The cubic root of 6508447997 is about 1867.0637474388.

Adding to 6508447997 its sum of digits (59), we get a palindrome (6508448056).

The spelling of 6508447997 in words is "six billion, five hundred eight million, four hundred forty-seven thousand, nine hundred ninety-seven".