16817680489 has 9 divisors (see below), whose sum is σ = 17243323959. Its totient is φ = 16402305840.

The previous prime is 16817680459. The next prime is 16817680543. The reversal of 16817680489 is 98408671861.

The square root of 16817680489 is 129683.

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

It can be written as a sum of positive squares in only one way, i.e., 810370089 + 16007310400 = 28467^2 + 126520^2 .

It is not a de Polignac number, because 16817680489 - 2¹¹ = 16817678441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16817680409) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5315422 + ... + 5318584.

Almost surely, 2^16817680489 is an apocalyptic number.

16817680489 is the 129683-rd square number.

16817680489 is the 64842-nd centered octagonal number.

It is an amenable number.

16817680489 is a deficient number, since it is larger than the sum of its proper divisors (425643470).

16817680489 is an frugal number, since it uses more digits than its factorization.

16817680489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6408 (or 3204 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 58.

The spelling of 16817680489 in words is "sixteen billion, eight hundred seventeen million, six hundred eighty thousand, four hundred eighty-nine".