6399764897 has 2 divisors, whose sum is σ = 6399764898. Its totient is φ = 6399764896.

The previous prime is 6399764827. The next prime is 6399764963. The reversal of 6399764897 is 7984679936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5150071696 + 1249693201 = 71764^2 + 35351^2 .

It is a cyclic number.

It is not a de Polignac number, because 6399764897 - 2¹⁰ = 6399763873 is a prime.

It is not a weakly prime, because it can be changed into another prime (6399764827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199882448 + 3199882449.

It is an arithmetic number, because the mean of its divisors is an integer number (3199882449).

Almost surely, 2^6399764897 is an apocalyptic number.

It is an amenable number.

6399764897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399764897 is an equidigital number, since it uses as much as digits as its factorization.

6399764897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123451776, while the sum is 68.

The square root of 6399764897 is about 79998.5305927553. The cubic root of 6399764897 is about 1856.6127987613.

The spelling of 6399764897 in words is "six billion, three hundred ninety-nine million, seven hundred sixty-four thousand, eight hundred ninety-seven".