2243700661 has 4 divisors (see below), whose sum is σ = 2247848524. Its totient is φ = 2239552800.

The previous prime is 2243700653. The next prime is 2243700689. The reversal of 2243700661 is 1660073422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1789797636 + 453903025 = 42306^2 + 21305^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243700661 - 2³ = 2243700653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2243700061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073120 + ... + 2074201.

It is an arithmetic number, because the mean of its divisors is an integer number (561962131).

Almost surely, 2^2243700661 is an apocalyptic number.

It is an amenable number.

2243700661 is a deficient number, since it is larger than the sum of its proper divisors (4147863).

2243700661 is an equidigital number, since it uses as much as digits as its factorization.

2243700661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147862.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 2243700661 is about 47367.7174983131. The cubic root of 2243700661 is about 1309.1466697557.

The spelling of 2243700661 in words is "two billion, two hundred forty-three million, seven hundred thousand, six hundred sixty-one".