16855321169 has 4 divisors (see below), whose sum is σ = 16856794944. Its totient is φ = 16853847396.

The previous prime is 16855321163. The next prime is 16855321183. The reversal of 16855321169 is 96112355861.

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 a cyclic number.

It is not a de Polignac number, because 16855321169 - 2⁸ = 16855320913 is a prime.

It is a super-2 number, since 2×16855321169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16855321163) 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 3 ways as a sum of consecutive naturals, for example, 719597 + ... + 742650.

It is an arithmetic number, because the mean of its divisors is an integer number (4214198736).

Almost surely, 2^16855321169 is an apocalyptic number.

It is an amenable number.

16855321169 is a deficient number, since it is larger than the sum of its proper divisors (1473775).

16855321169 is a wasteful number, since it uses less digits than its factorization.

16855321169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473774.

The product of its digits is 388800, while the sum is 47.

The spelling of 16855321169 in words is "sixteen billion, eight hundred fifty-five million, three hundred twenty-one thousand, one hundred sixty-nine".