660064459 has 2 divisors, whose sum is σ = 660064460. Its totient is φ = 660064458.

The previous prime is 660064421. The next prime is 660064499. The reversal of 660064459 is 954460066.

It is an a-pointer prime, because the next prime (660064499) can be obtained adding 660064459 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660064459 - 2¹¹ = 660062411 is a prime.

It is not a weakly prime, because it can be changed into another prime (660064499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330032229 + 330032230.

It is an arithmetic number, because the mean of its divisors is an integer number (330032230).

Almost surely, 2^660064459 is an apocalyptic number.

660064459 is a deficient number, since it is larger than the sum of its proper divisors (1).

660064459 is an equidigital number, since it uses as much as digits as its factorization.

660064459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 660064459 is about 25691.7196582868. The cubic root of 660064459 is about 870.6871125349.

The spelling of 660064459 in words is "six hundred sixty million, sixty-four thousand, four hundred fifty-nine".