660443779 has 2 divisors, whose sum is σ = 660443780. Its totient is φ = 660443778.

The previous prime is 660443741. The next prime is 660443789. The reversal of 660443779 is 977344066.

660443779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660443779 - 2¹⁷ = 660312707 is a prime.

It is not a weakly prime, because it can be changed into another prime (660443789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330221889 + 330221890.

It is an arithmetic number, because the mean of its divisors is an integer number (330221890).

Almost surely, 2^660443779 is an apocalyptic number.

660443779 is a deficient number, since it is larger than the sum of its proper divisors (1).

660443779 is an equidigital number, since it uses as much as digits as its factorization.

660443779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 46.

The square root of 660443779 is about 25699.1007430221. The cubic root of 660443779 is about 870.8538668500.

The spelling of 660443779 in words is "six hundred sixty million, four hundred forty-three thousand, seven hundred seventy-nine".