217105764445 has 16 divisors (see below), whose sum is σ = 262564623360. Its totient is φ = 172330820800.

The previous prime is 217105764437. The next prime is 217105764461. The reversal of 217105764445 is 544467501712.

It is not a de Polignac number, because 217105764445 - 2³ = 217105764437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217105764395 and 217105764404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79290 + ... + 663700.

It is an arithmetic number, because the mean of its divisors is an integer number (16410288960).

Almost surely, 2^217105764445 is an apocalyptic number.

It is an amenable number.

217105764445 is a deficient number, since it is larger than the sum of its proper divisors (45458858915).

217105764445 is a wasteful number, since it uses less digits than its factorization.

217105764445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584996.

The product of its (nonzero) digits is 940800, while the sum is 46.

The spelling of 217105764445 in words is "two hundred seventeen billion, one hundred five million, seven hundred sixty-four thousand, four hundred forty-five".