16434247431509 has 2 divisors, whose sum is σ = 16434247431510. Its totient is φ = 16434247431508.

The previous prime is 16434247431491. The next prime is 16434247431599. The reversal of 16434247431509 is 90513474243461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8809635418609 + 7624612012900 = 2968103^2 + 2761270^2 .

It is a cyclic number.

It is not a de Polignac number, because 16434247431509 - 2⁴⁰ = 15334735803733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16434247431599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8217123715754 + 8217123715755.

It is an arithmetic number, because the mean of its divisors is an integer number (8217123715755).

Almost surely, 2^{16434247431509} is an apocalyptic number.

It is an amenable number.

16434247431509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16434247431509 is an equidigital number, since it uses as much as digits as its factorization.

16434247431509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 53.

The spelling of 16434247431509 in words is "sixteen trillion, four hundred thirty-four billion, two hundred forty-seven million, four hundred thirty-one thousand, five hundred nine".