664163459 has 2 divisors, whose sum is σ = 664163460. Its totient is φ = 664163458.

The previous prime is 664163447. The next prime is 664163473. The reversal of 664163459 is 954361466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664163459 - 2⁴ = 664163443 is a prime.

It is a super-2 number, since 2×664163459² = 882226200541689362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (664163359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332081729 + 332081730.

It is an arithmetic number, because the mean of its divisors is an integer number (332081730).

Almost surely, 2^664163459 is an apocalyptic number.

664163459 is a deficient number, since it is larger than the sum of its proper divisors (1).

664163459 is an equidigital number, since it uses as much as digits as its factorization.

664163459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 664163459 is about 25771.3689779957. The cubic root of 664163459 is about 872.4857167417.

The spelling of 664163459 in words is "six hundred sixty-four million, one hundred sixty-three thousand, four hundred fifty-nine".