1220637044418 has 64 divisors (see below), whose sum is σ = 2690565341184. Its totient is φ = 369153430800.

The previous prime is 1220637044401. The next prime is 1220637044441. The reversal of 1220637044418 is 8144407360221.

It is a super-3 number, since 3×1220637044418³ (a number of 37 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220637044418.

It is an unprimeable number.

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, 3865023 + ... + 4168893.

It is an arithmetic number, because the mean of its divisors is an integer number (42040083456).

Almost surely, 2^{1220637044418} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220637044418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1345282670592).

1220637044418 is an abundant number, since it is smaller than the sum of its proper divisors (1469928296766).

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

1220637044418 is a wasteful number, since it uses less digits than its factorization.

1220637044418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304412 (or 304390 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 1220637044418 in words is "one trillion, two hundred twenty billion, six hundred thirty-seven million, forty-four thousand, four hundred eighteen".