13223387556 has 18 divisors (see below), whose sum is σ = 33425785302. Its totient is φ = 4407795840.

The previous prime is 13223387503. The next prime is 13223387591. The reversal of 13223387556 is 65578332231.

13223387556 is a `hidden beast` number, since 13 + 2 + 2 + 3 + 3 + 87 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11548941156 + 1674446400 = 107466^2 + 40920^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183658125 + ... + 183658196.

Almost surely, 2^13223387556 is an apocalyptic number.

It is an amenable number.

13223387556 is an abundant number, since it is smaller than the sum of its proper divisors (20202397746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13223387556 is a wasteful number, since it uses less digits than its factorization.

13223387556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367316331 (or 367316326 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The spelling of 13223387556 in words is "thirteen billion, two hundred twenty-three million, three hundred eighty-seven thousand, five hundred fifty-six".