16856969220 has 648 divisors, whose sum is σ = 66156906816. Its totient is φ = 3460713984.

The previous prime is 16856969209. The next prime is 16856969221. The reversal of 16856969220 is 2296965861.

It is a happy number.

16856969220 is a `hidden beast` number, since 16 + 8 + 569 + 69 + 2 + 2 + 0 = 666.

It is a super-2 number, since 2×16856969220² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16856969221) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 64094809 + ... + 64095071.

It is an arithmetic number, because the mean of its divisors is an integer number (102093992).

Almost surely, 2^16856969220 is an apocalyptic number.

16856969220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16856969220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33078453408).

16856969220 is an abundant number, since it is smaller than the sum of its proper divisors (49299937596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16856969220 is a wasteful number, since it uses less digits than its factorization.

16856969220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 16856969220 in words is "sixteen billion, eight hundred fifty-six million, nine hundred sixty-nine thousand, two hundred twenty".