6466643839 has 2 divisors, whose sum is σ = 6466643840. Its totient is φ = 6466643838.

The previous prime is 6466643831. The next prime is 6466643873. The reversal of 6466643839 is 9383466646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6466643839 - 2³ = 6466643831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6466643839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6466643831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233321919 + 3233321920.

It is an arithmetic number, because the mean of its divisors is an integer number (3233321920).

Almost surely, 2^6466643839 is an apocalyptic number.

6466643839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6466643839 is an equidigital number, since it uses as much as digits as its factorization.

6466643839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 55.

The square root of 6466643839 is about 80415.4452763895. The cubic root of 6466643839 is about 1863.0577368079.

The spelling of 6466643839 in words is "six billion, four hundred sixty-six million, six hundred forty-three thousand, eight hundred thirty-nine".