215534314243 has 6 divisors (see below), whose sum is σ = 225312809204. Its totient is φ = 206163256596.

The previous prime is 215534314189. The next prime is 215534314253. The reversal of 215534314243 is 342413435512.

It is a de Polignac number, because none of the positive numbers 2^k-215534314243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215534314253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203718105 + ... + 203719162.

Almost surely, 2^215534314243 is an apocalyptic number.

215534314243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

215534314243 is a deficient number, since it is larger than the sum of its proper divisors (9778494961).

215534314243 is an equidigital number, since it uses as much as digits as its factorization.

215534314243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407437313 (or 407437290 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

Adding to 215534314243 its reverse (342413435512), we get a palindrome (557947749755).

The spelling of 215534314243 in words is "two hundred fifteen billion, five hundred thirty-four million, three hundred fourteen thousand, two hundred forty-three".