2221567856 has 40 divisors (see below), whose sum is σ = 4535066880. Its totient is φ = 1051337664.

The previous prime is 2221567853. The next prime is 2221567883. The reversal of 2221567856 is 6587651222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221567853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400655 + ... + 406161.

It is an arithmetic number, because the mean of its divisors is an integer number (113376672).

Almost surely, 2^2221567856 is an apocalyptic number.

It is an amenable number.

2221567856 is an abundant number, since it is smaller than the sum of its proper divisors (2313499024).

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

2221567856 is a wasteful number, since it uses less digits than its factorization.

2221567856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6861 (or 6855 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 2221567856 is about 47133.5109661905. The cubic root of 2221567856 is about 1304.8277799577.

The spelling of 2221567856 in words is "two billion, two hundred twenty-one million, five hundred sixty-seven thousand, eight hundred fifty-six".