6399188489 has 2 divisors, whose sum is σ = 6399188490. Its totient is φ = 6399188488.

The previous prime is 6399188479. The next prime is 6399188503. The reversal of 6399188489 is 9848819936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5525394889 + 873793600 = 74333^2 + 29560^2 .

It is a cyclic number.

It is not a de Polignac number, because 6399188489 - 2⁴ = 6399188473 is a prime.

It is a super-2 number, since 2×6399188489² = 81899226635500206242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6399188479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199594244 + 3199594245.

It is an arithmetic number, because the mean of its divisors is an integer number (3199594245).

Almost surely, 2^6399188489 is an apocalyptic number.

It is an amenable number.

6399188489 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399188489 is an equidigital number, since it uses as much as digits as its factorization.

6399188489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26873856, while the sum is 65.

The square root of 6399188489 is about 79994.9278954610. The cubic root of 6399188489 is about 1856.5570572032.

The spelling of 6399188489 in words is "six billion, three hundred ninety-nine million, one hundred eighty-eight thousand, four hundred eighty-nine".