6464244399989 has 2 divisors, whose sum is σ = 6464244399990. Its totient is φ = 6464244399988.

The previous prime is 6464244399983. The next prime is 6464244400109. The reversal of 6464244399989 is 9899934424646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6220948837489 + 243295562500 = 2494183^2 + 493250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6464244399989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6464244399983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3232122199994 + 3232122199995.

It is an arithmetic number, because the mean of its divisors is an integer number (3232122199995).

Almost surely, 2^{6464244399989} is an apocalyptic number.

It is an amenable number.

6464244399989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6464244399989 is an equidigital number, since it uses as much as digits as its factorization.

6464244399989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2902376448, while the sum is 77.

The spelling of 6464244399989 in words is "six trillion, four hundred sixty-four billion, two hundred forty-four million, three hundred ninety-nine thousand, nine hundred eighty-nine".