15505543223 has 4 divisors (see below), whose sum is σ = 15506547840. Its totient is φ = 15504538608.

The previous prime is 15505543211. The next prime is 15505543259. The reversal of 15505543223 is 32234550551.

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 15505543223 - 2³⁰ = 14431801399 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 (15505543423) 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, 478790 + ... + 510147.

It is an arithmetic number, because the mean of its divisors is an integer number (3876636960).

Almost surely, 2^15505543223 is an apocalyptic number.

15505543223 is a deficient number, since it is larger than the sum of its proper divisors (1004617).

15505543223 is an equidigital number, since it uses as much as digits as its factorization.

15505543223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004616.

The product of its (nonzero) digits is 90000, while the sum is 35.

The spelling of 15505543223 in words is "fifteen billion, five hundred five million, five hundred forty-three thousand, two hundred twenty-three".