664275779 has 2 divisors, whose sum is σ = 664275780. Its totient is φ = 664275778.

The previous prime is 664275761. The next prime is 664275791. The reversal of 664275779 is 977572466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664275779 - 2¹⁶ = 664210243 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664275779.

It is not a weakly prime, because it can be changed into another prime (664275709) 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 as a sum of consecutive naturals, namely, 332137889 + 332137890.

It is an arithmetic number, because the mean of its divisors is an integer number (332137890).

Almost surely, 2^664275779 is an apocalyptic number.

664275779 is a deficient number, since it is larger than the sum of its proper divisors (1).

664275779 is an equidigital number, since it uses as much as digits as its factorization.

664275779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 53.

The square root of 664275779 is about 25773.5480483382. The cubic root of 664275779 is about 872.5348974419.

The spelling of 664275779 in words is "six hundred sixty-four million, two hundred seventy-five thousand, seven hundred seventy-nine".