2221768647 has 24 divisors (see below), whose sum is σ = 3681344160. Its totient is φ = 1264852800.

The previous prime is 2221768643. The next prime is 2221768649. The reversal of 2221768647 is 7468671222.

It is a happy number.

It is not a de Polignac number, because 2221768647 - 2² = 2221768643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221768643) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 48604 + ... + 82497.

It is an arithmetic number, because the mean of its divisors is an integer number (153389340).

Almost surely, 2^2221768647 is an apocalyptic number.

2221768647 is a deficient number, since it is larger than the sum of its proper divisors (1459575513).

2221768647 is a wasteful number, since it uses less digits than its factorization.

2221768647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131383 (or 131380 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 2221768647 is about 47135.6409418605. The cubic root of 2221768647 is about 1304.8670900004.

The spelling of 2221768647 in words is "two billion, two hundred twenty-one million, seven hundred sixty-eight thousand, six hundred forty-seven".