717173553321 has 9 divisors (see below), whose sum is σ = 1035921024541. Its totient is φ = 478114008492.

The previous prime is 717173553307. The next prime is 717173553379. The reversal of 717173553321 is 123355371717.

The square root of 717173553321 is 846861.

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

717173553321 is a `hidden beast` number, since 7 + 1 + 7 + 1 + 73 + 553 + 3 + 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 717173553321 - 2⁵ = 717173553289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (717173553521) 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, 2399440 + ... + 2681726.

Almost surely, 2^717173553321 is an apocalyptic number.

717173553321 is the 846861-st square number.

717173553321 is the 423431-st centered octagonal number.

It is an amenable number.

717173553321 is a deficient number, since it is larger than the sum of its proper divisors (318747471220).

717173553321 is an frugal number, since it uses more digits than its factorization.

717173553321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564580 (or 282290 counting only the distinct ones).

The product of its digits is 463050, while the sum is 45.

The spelling of 717173553321 in words is "seven hundred seventeen billion, one hundred seventy-three million, five hundred fifty-three thousand, three hundred twenty-one".