1220340643236 has 144 divisors (see below), whose sum is σ = 3629601743040. Its totient is φ = 340830339840.

The previous prime is 1220340643219. The next prime is 1220340643259. The reversal of 1220340643236 is 6323460430221.

1220340643236 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 3 + 4 + 0 + 643 + 2 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1220340643236.

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 47 ways as a sum of consecutive naturals, for example, 3180135 + ... + 3543153.

It is an arithmetic number, because the mean of its divisors is an integer number (25205567660).

Almost surely, 2^{1220340643236} 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 1220340643236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814800871520).

1220340643236 is an abundant number, since it is smaller than the sum of its proper divisors (2409261099804).

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

1220340643236 is a wasteful number, since it uses less digits than its factorization.

1220340643236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363706 (or 363701 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

The spelling of 1220340643236 in words is "one trillion, two hundred twenty billion, three hundred forty million, six hundred forty-three thousand, two hundred thirty-six".