16553869309 has 4 divisors (see below), whose sum is σ = 16780634716. Its totient is φ = 16327103904.

The previous prime is 16553869279. The next prime is 16553869361. The reversal of 16553869309 is 90396835561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5665572900 + 10888296409 = 75270^2 + 104347^2 .

It is a cyclic number.

It is not a de Polignac number, because 16553869309 - 2¹⁷ = 16553738237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16553869309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16553869379) 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, 113382594 + ... + 113382739.

It is an arithmetic number, because the mean of its divisors is an integer number (4195158679).

Almost surely, 2^16553869309 is an apocalyptic number.

It is an amenable number.

16553869309 is a deficient number, since it is larger than the sum of its proper divisors (226765407).

16553869309 is an equidigital number, since it uses as much as digits as its factorization.

16553869309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226765406.

The product of its (nonzero) digits is 5248800, while the sum is 55.

The spelling of 16553869309 in words is "sixteen billion, five hundred fifty-three million, eight hundred sixty-nine thousand, three hundred nine".