656665673 has 2 divisors, whose sum is σ = 656665674. Its totient is φ = 656665672.

The previous prime is 656665657. The next prime is 656665697. The reversal of 656665673 is 376566656.

656665673 is digitally balanced in base 2, 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., 655206409 + 1459264 = 25597^2 + 1208^2 .

It is a cyclic number.

It is not a de Polignac number, because 656665673 - 2⁴ = 656665657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (656605673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328332836 + 328332837.

It is an arithmetic number, because the mean of its divisors is an integer number (328332837).

Almost surely, 2^656665673 is an apocalyptic number.

It is an amenable number.

656665673 is a deficient number, since it is larger than the sum of its proper divisors (1).

656665673 is an equidigital number, since it uses as much as digits as its factorization.

656665673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 50.

The square root of 656665673 is about 25625.4887368027. The cubic root of 656665673 is about 869.1901006455.

The spelling of 656665673 in words is "six hundred fifty-six million, six hundred sixty-five thousand, six hundred seventy-three".