11515522223 has 4 divisors (see below), whose sum is σ = 12121602360. Its totient is φ = 10909442088.

The previous prime is 11515522201. The next prime is 11515522231. The reversal of 11515522223 is 32222551511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32222551511 = 155521 ⋅207191.

It is a cyclic number.

It is not a de Polignac number, because 11515522223 - 2²⁴ = 11498745007 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 (11515521223) 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, 303040040 + ... + 303040077.

It is an arithmetic number, because the mean of its divisors is an integer number (3030400590).

Almost surely, 2^11515522223 is an apocalyptic number.

11515522223 is a deficient number, since it is larger than the sum of its proper divisors (606080137).

11515522223 is an equidigital number, since it uses as much as digits as its factorization.

11515522223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606080136.

The product of its digits is 6000, while the sum is 29.

The spelling of 11515522223 in words is "eleven billion, five hundred fifteen million, five hundred twenty-two thousand, two hundred twenty-three".