5643078809 has 2 divisors, whose sum is σ = 5643078810. Its totient is φ = 5643078808.

The previous prime is 5643078781. The next prime is 5643078853. The reversal of 5643078809 is 9088703465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3183216400 + 2459862409 = 56420^2 + 49597^2 .

It is a cyclic number.

It is not a de Polignac number, because 5643078809 - 2¹² = 5643074713 is a prime.

It is not a weakly prime, because it can be changed into another prime (5643078409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2821539404 + 2821539405.

It is an arithmetic number, because the mean of its divisors is an integer number (2821539405).

Almost surely, 2^5643078809 is an apocalyptic number.

It is an amenable number.

5643078809 is a deficient number, since it is larger than the sum of its proper divisors (1).

5643078809 is an equidigital number, since it uses as much as digits as its factorization.

5643078809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 5643078809 is about 75120.4287061782. The cubic root of 5643078809 is about 1780.3499300455.

The spelling of 5643078809 in words is "five billion, six hundred forty-three million, seventy-eight thousand, eight hundred nine".