6398733997 has 2 divisors, whose sum is σ = 6398733998. Its totient is φ = 6398733996.

The previous prime is 6398733983. The next prime is 6398734061. The reversal of 6398733997 is 7993378936.

It is an a-pointer prime, because the next prime (6398734061) can be obtained adding 6398733997 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5825658276 + 573075721 = 76326^2 + 23939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6398733997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6398733947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199366998 + 3199366999.

It is an arithmetic number, because the mean of its divisors is an integer number (3199366999).

Almost surely, 2^6398733997 is an apocalyptic number.

It is an amenable number.

6398733997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6398733997 is an equidigital number, since it uses as much as digits as its factorization.

6398733997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 64.

The square root of 6398733997 is about 79992.0870899116. The cubic root of 6398733997 is about 1856.5131031764.

The spelling of 6398733997 in words is "six billion, three hundred ninety-eight million, seven hundred thirty-three thousand, nine hundred ninety-seven".