216240646253 has 4 divisors (see below), whose sum is σ = 218845955328. Its totient is φ = 213635337180.

The previous prime is 216240646189. The next prime is 216240646283. The reversal of 216240646253 is 352646042612.

216240646253 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216240646253 - 2⁶ = 216240646189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216240646253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216240646283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1302654413 + ... + 1302654578.

It is an arithmetic number, because the mean of its divisors is an integer number (54711488832).

Almost surely, 2^216240646253 is an apocalyptic number.

It is an amenable number.

216240646253 is a deficient number, since it is larger than the sum of its proper divisors (2605309075).

216240646253 is an equidigital number, since it uses as much as digits as its factorization.

216240646253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605309074.

The product of its (nonzero) digits is 414720, while the sum is 41.

Adding to 216240646253 its reverse (352646042612), we get a palindrome (568886688865).

The spelling of 216240646253 in words is "two hundred sixteen billion, two hundred forty million, six hundred forty-six thousand, two hundred fifty-three".