16855738369 has 4 divisors (see below), whose sum is σ = 16857720880. Its totient is φ = 16853755860.

The previous prime is 16855738321. The next prime is 16855738381. The reversal of 16855738369 is 96383755861.

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 16855738369 - 2¹⁷ = 16855607297 is a prime.

It is a super-2 number, since 2×16855738369² (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 (16855730369) 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, 978447 + ... + 995524.

It is an arithmetic number, because the mean of its divisors is an integer number (4214430220).

Almost surely, 2^16855738369 is an apocalyptic number.

It is an amenable number.

16855738369 is a deficient number, since it is larger than the sum of its proper divisors (1982511).

16855738369 is an equidigital number, since it uses as much as digits as its factorization.

16855738369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982510.

The product of its digits is 32659200, while the sum is 61.

The spelling of 16855738369 in words is "sixteen billion, eight hundred fifty-five million, seven hundred thirty-eight thousand, three hundred sixty-nine".