16609535999 has 4 divisors (see below), whose sum is σ = 18982326864. Its totient is φ = 14236745136.

The previous prime is 16609535939. The next prime is 16609536019. The reversal of 16609535999 is 99953590661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99953590661 = 137 ⋅729588253.

It is a cyclic number.

It is not a de Polignac number, because 16609535999 - 2⁸ = 16609535743 is a prime.

It is a super-2 number, since 2×16609535999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16609535909) 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, 1186395422 + ... + 1186395435.

It is an arithmetic number, because the mean of its divisors is an integer number (4745581716).

Almost surely, 2^16609535999 is an apocalyptic number.

16609535999 is a deficient number, since it is larger than the sum of its proper divisors (2372790865).

16609535999 is an equidigital number, since it uses as much as digits as its factorization.

16609535999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372790864.

The product of its (nonzero) digits is 17714700, while the sum is 62.

The spelling of 16609535999 in words is "sixteen billion, six hundred nine million, five hundred thirty-five thousand, nine hundred ninety-nine".