6434642789 has 2 divisors, whose sum is σ = 6434642790. Its totient is φ = 6434642788.

The previous prime is 6434642759. The next prime is 6434642801. The reversal of 6434642789 is 9872464346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6402720289 + 31922500 = 80017^2 + 5650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6434642789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6434642789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6434642729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3217321394 + 3217321395.

It is an arithmetic number, because the mean of its divisors is an integer number (3217321395).

Almost surely, 2^6434642789 is an apocalyptic number.

It is an amenable number.

6434642789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6434642789 is an equidigital number, since it uses as much as digits as its factorization.

6434642789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 53.

The square root of 6434642789 is about 80216.2252228313. The cubic root of 6434642789 is about 1859.9794568394.

The spelling of 6434642789 in words is "six billion, four hundred thirty-four million, six hundred forty-two thousand, seven hundred eighty-nine".