6438598889 has 2 divisors, whose sum is σ = 6438598890. Its totient is φ = 6438598888.

The previous prime is 6438598811. The next prime is 6438598927. The reversal of 6438598889 is 9888958346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4056670864 + 2381928025 = 63692^2 + 48805^2 .

It is a cyclic number.

It is not a de Polignac number, because 6438598889 - 2²⁰ = 6437550313 is a prime.

It is not a weakly prime, because it can be changed into another prime (6438598189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219299444 + 3219299445.

It is an arithmetic number, because the mean of its divisors is an integer number (3219299445).

Almost surely, 2^6438598889 is an apocalyptic number.

It is an amenable number.

6438598889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438598889 is an equidigital number, since it uses as much as digits as its factorization.

6438598889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119439360, while the sum is 68.

The square root of 6438598889 is about 80240.8804101750. The cubic root of 6438598889 is about 1860.3605584017.

The spelling of 6438598889 in words is "six billion, four hundred thirty-eight million, five hundred ninety-eight thousand, eight hundred eighty-nine".