667507213 has 2 divisors, whose sum is σ = 667507214. Its totient is φ = 667507212.

The previous prime is 667507177. The next prime is 667507229. The reversal of 667507213 is 312705766.

667507213 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 can be written as a sum of positive squares in only one way, i.e., 362026729 + 305480484 = 19027^2 + 17478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667507213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667507513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333753606 + 333753607.

It is an arithmetic number, because the mean of its divisors is an integer number (333753607).

Almost surely, 2^667507213 is an apocalyptic number.

It is an amenable number.

667507213 is a deficient number, since it is larger than the sum of its proper divisors (1).

667507213 is an equidigital number, since it uses as much as digits as its factorization.

667507213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 667507213 is about 25836.1609570772. The cubic root of 667507213 is about 873.9474529724.

The spelling of 667507213 in words is "six hundred sixty-seven million, five hundred seven thousand, two hundred thirteen".