2275905661 has 4 divisors (see below), whose sum is σ = 2280274524. Its totient is φ = 2271536800.

The previous prime is 2275905649. The next prime is 2275905689. The reversal of 2275905661 is 1665095722.

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 572692761 + 1703212900 = 23931^2 + 41270^2 .

It is a cyclic number.

It is not a de Polignac number, because 2275905661 - 2⁵ = 2275905629 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 (2275905061) 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, 2183650 + ... + 2184691.

It is an arithmetic number, because the mean of its divisors is an integer number (570068631).

Almost surely, 2^2275905661 is an apocalyptic number.

It is an amenable number.

2275905661 is a deficient number, since it is larger than the sum of its proper divisors (4368863).

2275905661 is an equidigital number, since it uses as much as digits as its factorization.

2275905661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4368862.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 2275905661 is about 47706.4530331065. The cubic root of 2275905661 is about 1315.3805586531.

The spelling of 2275905661 in words is "two billion, two hundred seventy-five million, nine hundred five thousand, six hundred sixty-one".