217306253115623 has 4 divisors (see below), whose sum is σ = 248350003560720. Its totient is φ = 186262502670528.

The previous prime is 217306253115593. The next prime is 217306253115649. The reversal of 217306253115623 is 326511352603712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 217306253115623 - 2¹⁴ = 217306253099239 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 (217306253115923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15521875222538 + ... + 15521875222551.

It is an arithmetic number, because the mean of its divisors is an integer number (62087500890180).

Almost surely, 2^{217306253115623} is an apocalyptic number.

217306253115623 is a deficient number, since it is larger than the sum of its proper divisors (31043750445097).

217306253115623 is an equidigital number, since it uses as much as digits as its factorization.

217306253115623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31043750445096.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 217306253115623 in words is "two hundred seventeen trillion, three hundred six billion, two hundred fifty-three million, one hundred fifteen thousand, six hundred twenty-three".