1218713311508 has 96 divisors (see below), whose sum is σ = 2815896400128. Its totient is φ = 446817484800.

The previous prime is 1218713311507. The next prime is 1218713311537. The reversal of 1218713311508 is 8051133178121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218713311507) 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 31 ways as a sum of consecutive naturals, for example, 38316860 + ... + 38348652.

It is an arithmetic number, because the mean of its divisors is an integer number (29332254168).

Almost surely, 2^{1218713311508} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218713311508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1407948200064).

1218713311508 is an abundant number, since it is smaller than the sum of its proper divisors (1597183088620).

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

1218713311508 is a wasteful number, since it uses less digits than its factorization.

1218713311508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39153 (or 39151 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 41.

Adding to 1218713311508 its reverse (8051133178121), we get a palindrome (9269846489629).

The spelling of 1218713311508 in words is "one trillion, two hundred eighteen billion, seven hundred thirteen million, three hundred eleven thousand, five hundred eight".