18352213556 has 6 divisors (see below), whose sum is σ = 32116373730. Its totient is φ = 9176106776.

The previous prime is 18352213549. The next prime is 18352213573. The reversal of 18352213556 is 65531225381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10875152656 + 7477060900 = 104284^2 + 86470^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2294026691 + ... + 2294026698.

It is an arithmetic number, because the mean of its divisors is an integer number (5352728955).

Almost surely, 2^18352213556 is an apocalyptic number.

It is an amenable number.

18352213556 is a deficient number, since it is larger than the sum of its proper divisors (13764160174).

18352213556 is a wasteful number, since it uses less digits than its factorization.

18352213556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588053393 (or 4588053391 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The spelling of 18352213556 in words is "eighteen billion, three hundred fifty-two million, two hundred thirteen thousand, five hundred fifty-six".