16545217515231 has 8 divisors (see below), whose sum is σ = 22060625347840. Its totient is φ = 11029977346392.

The previous prime is 16545217515173. The next prime is 16545217515257. The reversal of 16545217515231 is 13251571254561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16545217515231 - 2⁹ = 16545217514719 is a prime.

It is a super-2 number, since 2×16545217515231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16545207515231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41685505 + ... + 42080538.

It is an arithmetic number, because the mean of its divisors is an integer number (2757578168480).

Almost surely, 2^{16545217515231} is an apocalyptic number.

16545217515231 is a deficient number, since it is larger than the sum of its proper divisors (5515407832609).

16545217515231 is an equidigital number, since it uses as much as digits as its factorization.

16545217515231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83831885.

The product of its digits is 1260000, while the sum is 48.

Adding to 16545217515231 its reverse (13251571254561), we get a palindrome (29796788769792).

The spelling of 16545217515231 in words is "sixteen trillion, five hundred forty-five billion, two hundred seventeen million, five hundred fifteen thousand, two hundred thirty-one".