1218199970944 has 128 divisors (see below), whose sum is σ = 2768326087680. Its totient is φ = 528557736960.

The previous prime is 1218199970927. The next prime is 1218199970959. The reversal of 1218199970944 is 4490799918121.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1218199970944² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

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, 15732387 + ... + 15809629.

It is an arithmetic number, because the mean of its divisors is an integer number (21627547560).

Almost surely, 2^{1218199970944} 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 1218199970944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1384163043840).

1218199970944 is an abundant number, since it is smaller than the sum of its proper divisors (1550126116736).

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

1218199970944 is a wasteful number, since it uses less digits than its factorization.

1218199970944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778 (or 77766 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 64.

The spelling of 1218199970944 in words is "one trillion, two hundred eighteen billion, one hundred ninety-nine million, nine hundred seventy thousand, nine hundred forty-four".