1218055500 has 72 divisors (see below), whose sum is σ = 3842573280. Its totient is φ = 324813600.

The previous prime is 1218055499. The next prime is 1218055529. The reversal of 1218055500 is 55508121.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130840 + ... + 139839.

Almost surely, 2^1218055500 is an apocalyptic number.

1218055500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218055500 is an abundant number, since it is smaller than the sum of its proper divisors (2624517780).

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

1218055500 is a wasteful number, since it uses less digits than its factorization.

1218055500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270704 (or 270689 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 1218055500 is about 34900.6518563766. The cubic root of 1218055500 is about 1067.9617353626.

The spelling of 1218055500 in words is "one billion, two hundred eighteen million, fifty-five thousand, five hundred".