4444666661 has 2 divisors, whose sum is σ = 4444666662. Its totient is φ = 4444666660.

The previous prime is 4444666649. The next prime is 4444666691. The reversal of 4444666661 is 1666664444.

4444666661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4104964900 + 339701761 = 64070^2 + 18431^2 .

It is a cyclic number.

It is not a de Polignac number, because 4444666661 - 2¹⁴ = 4444650277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4444666601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2222333330 + 2222333331.

It is an arithmetic number, because the mean of its divisors is an integer number (2222333331).

Almost surely, 2^4444666661 is an apocalyptic number.

It is an amenable number.

4444666661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4444666661 is an equidigital number, since it uses as much as digits as its factorization.

4444666661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1990656, while the sum is 47.

The square root of 4444666661 is about 66668.3332700016. Note that the first 3 decimals coincide. The cubic root of 4444666661 is about 1644.1687840879.

The spelling of 4444666661 in words is "four billion, four hundred forty-four million, six hundred sixty-six thousand, six hundred sixty-one".