16855575861 has 4 divisors (see below), whose sum is σ = 22474101152. Its totient is φ = 11237050572.

The previous prime is 16855575857. The next prime is 16855575881. The reversal of 16855575861 is 16857555861.

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 not a de Polignac number, because 16855575861 - 2² = 16855575857 is a prime.

It is a super-2 number, since 2×16855575861² (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 (16855575851) 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, 2809262641 + ... + 2809262646.

It is an arithmetic number, because the mean of its divisors is an integer number (5618525288).

Almost surely, 2^16855575861 is an apocalyptic number.

It is an amenable number.

16855575861 is a deficient number, since it is larger than the sum of its proper divisors (5618525291).

16855575861 is an equidigital number, since it uses as much as digits as its factorization.

16855575861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5618525290.

The product of its digits is 10080000, while the sum is 57.

The spelling of 16855575861 in words is "sixteen billion, eight hundred fifty-five million, five hundred seventy-five thousand, eight hundred sixty-one".