667402273 has 2 divisors, whose sum is σ = 667402274. Its totient is φ = 667402272.

The previous prime is 667402271. The next prime is 667402289. The reversal of 667402273 is 372204766.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662702049 + 4700224 = 25743^2 + 2168^2 .

It is a cyclic number.

It is not a de Polignac number, because 667402273 - 2¹ = 667402271 is a prime.

Together with 667402271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (667402271) 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, 333701136 + 333701137.

It is an arithmetic number, because the mean of its divisors is an integer number (333701137).

Almost surely, 2^667402273 is an apocalyptic number.

It is an amenable number.

667402273 is a deficient number, since it is larger than the sum of its proper divisors (1).

667402273 is an equidigital number, since it uses as much as digits as its factorization.

667402273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 667402273 is about 25834.1300027696. The cubic root of 667402273 is about 873.9016522927.

The spelling of 667402273 in words is "six hundred sixty-seven million, four hundred two thousand, two hundred seventy-three".