667401347 has 2 divisors, whose sum is σ = 667401348. Its totient is φ = 667401346.

The previous prime is 667401341. The next prime is 667401379. The reversal of 667401347 is 743104766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667401347 - 2¹⁸ = 667139203 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667401347.

It is not a weakly prime, because it can be changed into another prime (667401341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333700673 + 333700674.

It is an arithmetic number, because the mean of its divisors is an integer number (333700674).

Almost surely, 2^667401347 is an apocalyptic number.

667401347 is a deficient number, since it is larger than the sum of its proper divisors (1).

667401347 is an equidigital number, since it uses as much as digits as its factorization.

667401347 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 38.

The square root of 667401347 is about 25834.1120807354. The cubic root of 667401347 is about 873.9012481220.

The spelling of 667401347 in words is "six hundred sixty-seven million, four hundred one thousand, three hundred forty-seven".