16917944761 has 3 divisors (see below), whose sum is σ = 16918074831. Its totient is φ = 16917814692.

The previous prime is 16917944749. The next prime is 16917944783. The reversal of 16917944761 is 16744971961.

It is a happy number.

The square root of 16917944761 is 130069.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16744971961 = 3779 ⋅4431059.

It can be written as a sum of positive squares in only one way, i.e., 13209134761 + 3708810000 = 114931^2 + 60900^2 .

It is not a de Polignac number, because 16917944761 - 2⁷ = 16917944633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16917954761) 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 2 ways as a sum of consecutive naturals, for example, 65035 + ... + 195103.

It is an arithmetic number, because the mean of its divisors is an integer number (5639358277).

Almost surely, 2^16917944761 is an apocalyptic number.

16917944761 is the 130069-th square number.

16917944761 is the 65035-th centered octagonal number.

It is an amenable number.

16917944761 is a deficient number, since it is larger than the sum of its proper divisors (130070).

16917944761 is an frugal number, since it uses more digits than its factorization.

16917944761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260138 (or 130069 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 55.

The spelling of 16917944761 in words is "sixteen billion, nine hundred seventeen million, nine hundred forty-four thousand, seven hundred sixty-one".