16804607309 has 4 divisors (see below), whose sum is σ = 19205265504. Its totient is φ = 14403949116.

The previous prime is 16804607263. The next prime is 16804607329. The reversal of 16804607309 is 90370640861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16804607309 - 2²⁴ = 16787830093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16804607309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16804607329) 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, 1200329087 + ... + 1200329100.

It is an arithmetic number, because the mean of its divisors is an integer number (4801316376).

Almost surely, 2^16804607309 is an apocalyptic number.

It is an amenable number.

16804607309 is a deficient number, since it is larger than the sum of its proper divisors (2400658195).

16804607309 is an equidigital number, since it uses as much as digits as its factorization.

16804607309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400658194.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 16804607309 in words is "sixteen billion, eight hundred four million, six hundred seven thousand, three hundred nine".