2221772969856 has 128 divisors (see below), whose sum is σ = 6442621234560. Its totient is φ = 672790906880.

The previous prime is 2221772969839. The next prime is 2221772969869. The reversal of 2221772969856 is 6589692771222.

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

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5843350 + ... + 6211946.

It is an arithmetic number, because the mean of its divisors is an integer number (50332978395).

Almost surely, 2^{2221772969856} 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 2221772969856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3221310617280).

2221772969856 is an abundant number, since it is smaller than the sum of its proper divisors (4220848264704).

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

2221772969856 is a wasteful number, since it uses less digits than its factorization.

2221772969856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370052 (or 370040 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 66.

The spelling of 2221772969856 in words is "two trillion, two hundred twenty-one billion, seven hundred seventy-two million, nine hundred sixty-nine thousand, eight hundred fifty-six".