17689798009 has 15 divisors (see below), whose sum is σ = 19188277737. Its totient is φ = 16308295848.

The previous prime is 17689797997. The next prime is 17689798067. The reversal of 17689798009 is 90089798671.

The square root of 17689798009 is 133003.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8770884409 + 8918913600 = 93653^2 + 94440^2 .

It is not a de Polignac number, because 17689798009 - 2⁵ = 17689797977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17689790009) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 22477114 + ... + 22477900.

Almost surely, 2^17689798009 is an apocalyptic number.

17689798009 is the 133003-rd square number.

17689798009 is the 66502-nd centered octagonal number.

It is an amenable number.

17689798009 is a deficient number, since it is larger than the sum of its proper divisors (1498479728).

17689798009 is an frugal number, since it uses more digits than its factorization.

17689798009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 64.

Multiplying 17689798009 by its sum of digits (64), we get a square (1132147072576 = 1064024²).

The spelling of 17689798009 in words is "seventeen billion, six hundred eighty-nine million, seven hundred ninety-eight thousand, nine".