16543596409 has 2 divisors, whose sum is σ = 16543596410. Its totient is φ = 16543596408.

The previous prime is 16543596403. The next prime is 16543596449. The reversal of 16543596409 is 90469534561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11182428009 + 5361168400 = 105747^2 + 73220^2 .

It is a cyclic number.

It is not a de Polignac number, because 16543596409 - 2⁷ = 16543596281 is a prime.

It is not a weakly prime, because it can be changed into another prime (16543596403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8271798204 + 8271798205.

It is an arithmetic number, because the mean of its divisors is an integer number (8271798205).

Almost surely, 2^16543596409 is an apocalyptic number.

It is an amenable number.

16543596409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16543596409 is an equidigital number, since it uses as much as digits as its factorization.

16543596409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 16543596409 in words is "sixteen billion, five hundred forty-three million, five hundred ninety-six thousand, four hundred nine".