2220660000644 has 6 divisors (see below), whose sum is σ = 3886155001134. Its totient is φ = 1110330000320.

The previous prime is 2220660000623. The next prime is 2220660000677. The reversal of 2220660000644 is 4460000660222.

It can be written as a sum of positive squares in only one way, i.e., 1632772840000 + 587887160644 = 1277800^2 + 766738^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2220660000644.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277582500077 + ... + 277582500084.

It is an arithmetic number, because the mean of its divisors is an integer number (647692500189).

Almost surely, 2^{2220660000644} is an apocalyptic number.

It is an amenable number.

2220660000644 is a deficient number, since it is larger than the sum of its proper divisors (1665495000490).

2220660000644 is a wasteful number, since it uses less digits than its factorization.

2220660000644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555165000165 (or 555165000163 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 2220660000644 its reverse (4460000660222), we get a palindrome (6680660660866).

The spelling of 2220660000644 in words is "two trillion, two hundred twenty billion, six hundred sixty million, six hundred forty-four", and thus it is an aban number.