664339187 has 2 divisors, whose sum is σ = 664339188. Its totient is φ = 664339186.

The previous prime is 664339171. The next prime is 664339211. The reversal of 664339187 is 781933466.

It is a happy number.

664339187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664339187 - 2⁴ = 664339171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664339127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332169593 + 332169594.

It is an arithmetic number, because the mean of its divisors is an integer number (332169594).

Almost surely, 2^664339187 is an apocalyptic number.

664339187 is a deficient number, since it is larger than the sum of its proper divisors (1).

664339187 is an equidigital number, since it uses as much as digits as its factorization.

664339187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 664339187 is about 25774.7781173767. The cubic root of 664339187 is about 872.5626589702.

The spelling of 664339187 in words is "six hundred sixty-four million, three hundred thirty-nine thousand, one hundred eighty-seven".