2005446661 has 4 divisors (see below), whose sum is σ = 2014204300. Its totient is φ = 1996689024.

The previous prime is 2005446649. The next prime is 2005446673. The reversal of 2005446661 is 1666445002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1666445002 = 2 ⋅833222501.

It is an interprime number because it is at equal distance from previous prime (2005446649) and next prime (2005446673).

It can be written as a sum of positive squares in 2 ways, for example, as 1565705761 + 439740900 = 39569^2 + 20970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005446661 - 2⁵ = 2005446629 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 (2005446601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4378476 + ... + 4378933.

It is an arithmetic number, because the mean of its divisors is an integer number (503551075).

Almost surely, 2^2005446661 is an apocalyptic number.

It is an amenable number.

2005446661 is a deficient number, since it is larger than the sum of its proper divisors (8757639).

2005446661 is an equidigital number, since it uses as much as digits as its factorization.

2005446661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8757638.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 2005446661 is about 44782.2136679285. The cubic root of 2005446661 is about 1261.0637403548.

The spelling of 2005446661 in words is "two billion, five million, four hundred forty-six thousand, six hundred sixty-one".