1818457565556 has 48 divisors (see below), whose sum is σ = 4466495900160. Its totient is φ = 574235756640.

The previous prime is 1818457565501. The next prime is 1818457565569. The reversal of 1818457565556 is 6555657548181.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13335601 + ... + 13471271.

It is an arithmetic number, because the mean of its divisors is an integer number (93051997920).

Almost surely, 2^{1818457565556} is an apocalyptic number.

It is an amenable number.

1818457565556 is an abundant number, since it is smaller than the sum of its proper divisors (2648038334604).

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

1818457565556 is a wasteful number, since it uses less digits than its factorization.

1818457565556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194484 (or 194482 counting only the distinct ones).

The product of its digits is 201600000, while the sum is 66.

The spelling of 1818457565556 in words is "one trillion, eight hundred eighteen billion, four hundred fifty-seven million, five hundred sixty-five thousand, five hundred fifty-six".