664425163 has 2 divisors, whose sum is σ = 664425164. Its totient is φ = 664425162.

The previous prime is 664425149. The next prime is 664425187. The reversal of 664425163 is 361524466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664425163 - 2¹³ = 664416971 is a prime.

It is not a weakly prime, because it can be changed into another prime (664425103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332212581 + 332212582.

It is an arithmetic number, because the mean of its divisors is an integer number (332212582).

Almost surely, 2^664425163 is an apocalyptic number.

664425163 is a deficient number, since it is larger than the sum of its proper divisors (1).

664425163 is an equidigital number, since it uses as much as digits as its factorization.

664425163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 37.

The square root of 664425163 is about 25776.4458954294. The cubic root of 664425163 is about 872.6002984836.

The spelling of 664425163 in words is "six hundred sixty-four million, four hundred twenty-five thousand, one hundred sixty-three".