667108009 has 2 divisors, whose sum is σ = 667108010. Its totient is φ = 667108008.

The previous prime is 667107949. The next prime is 667108019. The reversal of 667108009 is 900801766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648211600 + 18896409 = 25460^2 + 4347^2 .

It is a cyclic number.

It is not a de Polignac number, because 667108009 - 2²³ = 658719401 is a prime.

It is not a weakly prime, because it can be changed into another prime (667108019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333554004 + 333554005.

It is an arithmetic number, because the mean of its divisors is an integer number (333554005).

Almost surely, 2^667108009 is an apocalyptic number.

It is an amenable number.

667108009 is a deficient number, since it is larger than the sum of its proper divisors (1).

667108009 is an equidigital number, since it uses as much as digits as its factorization.

667108009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 667108009 is about 25828.4341182349. The cubic root of 667108009 is about 873.7731962326.

The spelling of 667108009 in words is "six hundred sixty-seven million, one hundred eight thousand, nine".