1218566204440 has 128 divisors (see below), whose sum is σ = 3112778833920. Its totient is φ = 426153715200.

The previous prime is 1218566204431. The next prime is 1218566204489. The reversal of 1218566204440 is 444026658121.

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 31 ways as a sum of consecutive naturals, for example, 46546 + ... + 1561825.

It is an arithmetic number, because the mean of its divisors is an integer number (24318584640).

Almost surely, 2^{1218566204440} is an apocalyptic number.

1218566204440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218566204440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1556389416960).

1218566204440 is an abundant number, since it is smaller than the sum of its proper divisors (1894212629480).

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

1218566204440 is a wasteful number, since it uses less digits than its factorization.

1218566204440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608473 (or 1608469 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 1218566204440 in words is "one trillion, two hundred eighteen billion, five hundred sixty-six million, two hundred four thousand, four hundred forty".