17161640160921 has 9 divisors (see below), whose sum is σ = 24789053739541. Its totient is φ = 11441085155292.

The previous prime is 17161640160883. The next prime is 17161640160961. The reversal of 17161640160921 is 12906104616171.

It is a happy number.

The square root of 17161640160921 is 4142661.

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

17161640160921 is a `hidden beast` number, since 1 + 7 + 1 + 6 + 16 + 4 + 0 + 1 + 609 + 21 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 17161640160921 - 2¹⁵ = 17161640128153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17161640160961) 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, 11737540 + ... + 13118426.

Almost surely, 2^{17161640160921} is an apocalyptic number.

17161640160921 is the 4142661-st square number.

17161640160921 is the 2071331-st centered octagonal number.

It is an amenable number.

17161640160921 is a deficient number, since it is larger than the sum of its proper divisors (7627413578620).

17161640160921 is an frugal number, since it uses more digits than its factorization.

17161640160921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761780 (or 1380890 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 17161640160921 in words is "seventeen trillion, one hundred sixty-one billion, six hundred forty million, one hundred sixty thousand, nine hundred twenty-one".