6464521997 has 2 divisors, whose sum is σ = 6464521998. Its totient is φ = 6464521996.

The previous prime is 6464521963. The next prime is 6464522011. The reversal of 6464521997 is 7991254646.

6464521997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3767381641 + 2697140356 = 61379^2 + 51934^2 .

It is a cyclic number.

It is not a de Polignac number, because 6464521997 - 2¹⁰ = 6464520973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6464521927) 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, 3232260998 + 3232260999.

It is an arithmetic number, because the mean of its divisors is an integer number (3232260999).

Almost surely, 2^6464521997 is an apocalyptic number.

It is an amenable number.

6464521997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6464521997 is an equidigital number, since it uses as much as digits as its factorization.

6464521997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The square root of 6464521997 is about 80402.2511936078. The cubic root of 6464521997 is about 1862.8539450266.

The spelling of 6464521997 in words is "six billion, four hundred sixty-four million, five hundred twenty-one thousand, nine hundred ninety-seven".