216523017173 has 16 divisors (see below), whose sum is σ = 241184952000. Its totient is φ = 193424324352.

The previous prime is 216523017163. The next prime is 216523017197. The reversal of 216523017173 is 371710325612.

It is a happy number.

It is not a de Polignac number, because 216523017173 - 2⁴ = 216523017157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216523017143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3692903 + ... + 3751076.

It is an arithmetic number, because the mean of its divisors is an integer number (15074059500).

Almost surely, 2^216523017173 is an apocalyptic number.

It is an amenable number.

216523017173 is a deficient number, since it is larger than the sum of its proper divisors (24661934827).

216523017173 is a wasteful number, since it uses less digits than its factorization.

216523017173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7444084.

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 216523017173 in words is "two hundred sixteen billion, five hundred twenty-three million, seventeen thousand, one hundred seventy-three".