217240567680889 has 3 divisors (see below), whose sum is σ = 217240582419973. Its totient is φ = 217240552941806.

The previous prime is 217240567680823. The next prime is 217240567680989. The reversal of 217240567680889 is 988086765042712.

The square root of 217240567680889 is 14739083.

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

217240567680889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 217240567680889 - 2³⁹ = 216690811867001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217240567680989) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7369542 + ... + 22108624.

Almost surely, 2^{217240567680889} is an apocalyptic number.

217240567680889 is the 14739083-rd square number.

217240567680889 is the 7369542-nd centered octagonal number.

It is an amenable number.

217240567680889 is a deficient number, since it is larger than the sum of its proper divisors (14739084).

217240567680889 is an frugal number, since it uses more digits than its factorization.

217240567680889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29478166 (or 14739083 counting only the distinct ones).

The product of its (nonzero) digits is 650280960, while the sum is 73.

The spelling of 217240567680889 in words is "two hundred seventeen trillion, two hundred forty billion, five hundred sixty-seven million, six hundred eighty thousand, eight hundred eighty-nine".