16817232681 has 12 divisors (see below), whose sum is σ = 24749890308. Its totient is φ = 10999950624.

The previous prime is 16817232673. The next prime is 16817232683. The reversal of 16817232681 is 18623271861.

It can be written as a sum of positive squares in 2 ways, for example, as 4295622681 + 12521610000 = 65541^2 + 111900^2 .

It is not a de Polignac number, because 16817232681 - 2³ = 16817232673 is a prime.

It is a super-3 number, since 3×16817232681³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16817232683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17627650 + ... + 17628603.

It is an arithmetic number, because the mean of its divisors is an integer number (2062490859).

Almost surely, 2^16817232681 is an apocalyptic number.

It is an amenable number.

16817232681 is a deficient number, since it is larger than the sum of its proper divisors (7932657627).

16817232681 is a wasteful number, since it uses less digits than its factorization.

16817232681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35256312 (or 35256309 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 16817232681 in words is "sixteen billion, eight hundred seventeen million, two hundred thirty-two thousand, six hundred eighty-one".