1218489012356 has 24 divisors (see below), whose sum is σ = 2658521482176. Its totient is φ = 474735978720.

The previous prime is 1218489012337. The next prime is 1218489012359. The reversal of 1218489012356 is 6532109848121.

It is not an unprimeable number, because it can be changed into a prime (1218489012359) 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 7 ways as a sum of consecutive naturals, for example, 1978066271 + ... + 1978066886.

It is an arithmetic number, because the mean of its divisors is an integer number (110771728424).

Almost surely, 2^{1218489012356} is an apocalyptic number.

It is an amenable number.

1218489012356 is an abundant number, since it is smaller than the sum of its proper divisors (1440032469820).

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

1218489012356 is a wasteful number, since it uses less digits than its factorization.

1218489012356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956133179 (or 3956133177 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 1218489012356 in words is "one trillion, two hundred eighteen billion, four hundred eighty-nine million, twelve thousand, three hundred fifty-six".