16503315211 has 4 divisors (see below), whose sum is σ = 16773861424. Its totient is φ = 16232769000.

The previous prime is 16503315187. The next prime is 16503315229. The reversal of 16503315211 is 11251330561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11251330561 = 113 ⋅99569297.

It is a cyclic number.

It is not a de Polignac number, because 16503315211 - 2¹¹ = 16503313163 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 16503315211.

It is not an unprimeable number, because it can be changed into a prime (16503315251) 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, 135273015 + ... + 135273136.

It is an arithmetic number, because the mean of its divisors is an integer number (4193465356).

Almost surely, 2^16503315211 is an apocalyptic number.

16503315211 is a deficient number, since it is larger than the sum of its proper divisors (270546213).

16503315211 is an equidigital number, since it uses as much as digits as its factorization.

16503315211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270546212.

The product of its (nonzero) digits is 2700, while the sum is 28.

Adding to 16503315211 its reverse (11251330561), we get a palindrome (27754645772).

The spelling of 16503315211 in words is "sixteen billion, five hundred three million, three hundred fifteen thousand, two hundred eleven".