16813378688 has 72 divisors (see below), whose sum is σ = 34178216355. Its totient is φ = 8238716928.

The previous prime is 16813378669. The next prime is 16813378723. The reversal of 16813378688 is 88687331861.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 5995714624 + 10817664064 = 77432^2 + 104008^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=91688.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 107091506 + ... + 107091662.

Almost surely, 2^16813378688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16813378688

16813378688 is an abundant number, since it is smaller than the sum of its proper divisors (17364837667).

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

16813378688 is an frugal number, since it uses more digits than its factorization.

16813378688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 232 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 59.

The spelling of 16813378688 in words is "sixteen billion, eight hundred thirteen million, three hundred seventy-eight thousand, six hundred eighty-eight".