16439434709 has 4 divisors (see below), whose sum is σ = 16439757900. Its totient is φ = 16439111520.

The previous prime is 16439434691. The next prime is 16439434747. The reversal of 16439434709 is 90743493461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90743493461 = 2633 ⋅34463917.

It can be written as a sum of positive squares in 2 ways, for example, as 8714782609 + 7724652100 = 93353^2 + 87890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16439434709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16439434009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66734 + ... + 193215.

It is an arithmetic number, because the mean of its divisors is an integer number (4109939475).

Almost surely, 2^16439434709 is an apocalyptic number.

It is an amenable number.

16439434709 is a deficient number, since it is larger than the sum of its proper divisors (323191).

16439434709 is an equidigital number, since it uses as much as digits as its factorization.

16439434709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323190.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 16439434709 in words is "sixteen billion, four hundred thirty-nine million, four hundred thirty-four thousand, seven hundred nine".