667342717 has 2 divisors, whose sum is σ = 667342718. Its totient is φ = 667342716.

The previous prime is 667342699. The next prime is 667342721. The reversal of 667342717 is 717243766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432057796 + 235284921 = 20786^2 + 15339^2 .

It is a cyclic number.

It is not a de Polignac number, because 667342717 - 2²⁷ = 533124989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667342727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333671358 + 333671359.

It is an arithmetic number, because the mean of its divisors is an integer number (333671359).

Almost surely, 2^667342717 is an apocalyptic number.

It is an amenable number.

667342717 is a deficient number, since it is larger than the sum of its proper divisors (1).

667342717 is an equidigital number, since it uses as much as digits as its factorization.

667342717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 43.

The square root of 667342717 is about 25832.9773158264. The cubic root of 667342717 is about 873.8756571585.

The spelling of 667342717 in words is "six hundred sixty-seven million, three hundred forty-two thousand, seven hundred seventeen".