16553621811 has 8 divisors (see below), whose sum is σ = 22487939280. Its totient is φ = 10827526112.

The previous prime is 16553621783. The next prime is 16553621857. The reversal of 16553621811 is 11812635561.

It is a happy number.

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 16553621811 - 2⁵ = 16553621779 is a prime.

It is a super-2 number, since 2×16553621811² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16553621811.

It is not an unprimeable number, because it can be changed into a prime (16553621891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52055256 + ... + 52055573.

It is an arithmetic number, because the mean of its divisors is an integer number (2810992410).

Almost surely, 2^16553621811 is an apocalyptic number.

16553621811 is a deficient number, since it is larger than the sum of its proper divisors (5934317469).

16553621811 is a wasteful number, since it uses less digits than its factorization.

16553621811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104110885.

The product of its digits is 43200, while the sum is 39.

The spelling of 16553621811 in words is "sixteen billion, five hundred fifty-three million, six hundred twenty-one thousand, eight hundred eleven".