243320225503 has 4 divisors (see below), whose sum is σ = 247911173208. Its totient is φ = 238729277800.

The previous prime is 243320225479. The next prime is 243320225549. The reversal of 243320225503 is 305522023342.

It is a happy number.

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 243320225503 - 2¹³ = 243320217311 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 (243320225303) 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, 2295473773 + ... + 2295473878.

It is an arithmetic number, because the mean of its divisors is an integer number (61977793302).

Almost surely, 2^243320225503 is an apocalyptic number.

243320225503 is a deficient number, since it is larger than the sum of its proper divisors (4590947705).

243320225503 is an equidigital number, since it uses as much as digits as its factorization.

243320225503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590947704.

The product of its (nonzero) digits is 43200, while the sum is 31.

Adding to 243320225503 its reverse (305522023342), we get a palindrome (548842248845).

The spelling of 243320225503 in words is "two hundred forty-three billion, three hundred twenty million, two hundred twenty-five thousand, five hundred three".