16553835561 has 8 divisors (see below), whose sum is σ = 23370120864. Its totient is φ = 10386720320.

The previous prime is 16553835553. The next prime is 16553835601.

16553835561 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16553835561 - 2³ = 16553835553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16553835561.

It is not an unprimeable number, because it can be changed into a prime (16553835521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162292455 + ... + 162292556.

It is an arithmetic number, because the mean of its divisors is an integer number (2921265108).

Almost surely, 2^16553835561 is an apocalyptic number.

It is an amenable number.

16553835561 is a deficient number, since it is larger than the sum of its proper divisors (6816285303).

16553835561 is a wasteful number, since it uses less digits than its factorization.

16553835561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324585031.

The product of its digits is 1620000, while the sum is 48.

Adding to 16553835561 its product of digits (1620000), we get a palindrome (16555455561).

The spelling of 16553835561 in words is "sixteen billion, five hundred fifty-three million, eight hundred thirty-five thousand, five hundred sixty-one".