2221710665 has 8 divisors (see below), whose sum is σ = 2731078728. Its totient is φ = 1734017920.

The previous prime is 2221710661. The next prime is 2221710683. The reversal of 2221710665 is 5660171222.

It can be written as a sum of positive squares in 4 ways, for example, as 14684224 + 2207026441 = 3832^2 + 46979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2221710665 - 2² = 2221710661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221710661) 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, 5418602 + ... + 5419011.

It is an arithmetic number, because the mean of its divisors is an integer number (341384841).

Almost surely, 2^2221710665 is an apocalyptic number.

It is an amenable number.

2221710665 is a deficient number, since it is larger than the sum of its proper divisors (509368063).

2221710665 is a wasteful number, since it uses less digits than its factorization.

2221710665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10837659.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 2221710665 is about 47135.0258830946. The cubic root of 2221710665 is about 1304.8557387642.

Adding to 2221710665 its reverse (5660171222), we get a palindrome (7881881887).

The spelling of 2221710665 in words is "two billion, two hundred twenty-one million, seven hundred ten thousand, six hundred sixty-five".