668615273 has 2 divisors, whose sum is σ = 668615274. Its totient is φ = 668615272.

The previous prime is 668615257. The next prime is 668615309. The reversal of 668615273 is 372516866.

668615273 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., 460188304 + 208426969 = 21452^2 + 14437^2 .

It is a cyclic number.

It is not a de Polignac number, because 668615273 - 2⁴ = 668615257 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 (668615203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334307636 + 334307637.

It is an arithmetic number, because the mean of its divisors is an integer number (334307637).

Almost surely, 2^668615273 is an apocalyptic number.

It is an amenable number.

668615273 is a deficient number, since it is larger than the sum of its proper divisors (1).

668615273 is an equidigital number, since it uses as much as digits as its factorization.

668615273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 668615273 is about 25857.5960406222. The cubic root of 668615273 is about 874.4307690326.

The spelling of 668615273 in words is "six hundred sixty-eight million, six hundred fifteen thousand, two hundred seventy-three".