6427919809 has 2 divisors, whose sum is σ = 6427919810. Its totient is φ = 6427919808.

The previous prime is 6427919783. The next prime is 6427919821. The reversal of 6427919809 is 9089197246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6415529409 + 12390400 = 80097^2 + 3520^2 .

It is a cyclic number.

It is not a de Polignac number, because 6427919809 - 2¹⁹ = 6427395521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6427919809.

It is not a weakly prime, because it can be changed into another prime (6427919909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3213959904 + 3213959905.

It is an arithmetic number, because the mean of its divisors is an integer number (3213959905).

Almost surely, 2^6427919809 is an apocalyptic number.

It is an amenable number.

6427919809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6427919809 is an equidigital number, since it uses as much as digits as its factorization.

6427919809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 6427919809 is about 80174.3089087770. The cubic root of 6427919809 is about 1859.3314559787.

The spelling of 6427919809 in words is "six billion, four hundred twenty-seven million, nine hundred nineteen thousand, eight hundred nine".