1218509864124 has 48 divisors (see below), whose sum is σ = 3249519452928. Its totient is φ = 348128552448.

The previous prime is 1218509864081. The next prime is 1218509864137. The reversal of 1218509864124 is 4214689058121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1413292 + ... + 2105804.

It is an arithmetic number, because the mean of its divisors is an integer number (67698321936).

Almost surely, 2^{1218509864124} is an apocalyptic number.

1218509864124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1218509864124 is an abundant number, since it is smaller than the sum of its proper divisors (2031009588804).

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

1218509864124 is a wasteful number, since it uses less digits than its factorization.

1218509864124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713474 (or 713472 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 1218509864124 in words is "one trillion, two hundred eighteen billion, five hundred nine million, eight hundred sixty-four thousand, one hundred twenty-four".