664685298 has 16 divisors (see below), whose sum is σ = 1477078560. Its totient is φ = 221561748.

The previous prime is 664685297. The next prime is 664685299. The reversal of 664685298 is 892586466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664685297) and next prime (664685299).

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12308987 = 664685298 / (6 + 6 + 4 + 6 + 8 + 5 + 2 + 9 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664685293) 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 in 7 ways as a sum of consecutive naturals, for example, 6154440 + ... + 6154547.

It is an arithmetic number, because the mean of its divisors is an integer number (92317410).

Almost surely, 2^664685298 is an apocalyptic number.

664685298 is an abundant number, since it is smaller than the sum of its proper divisors (812393262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664685298 is a wasteful number, since it uses less digits than its factorization.

664685298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12308998 (or 12308992 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 664685298 is about 25781.4913843245. The cubic root of 664685298 is about 872.7141634572.

The spelling of 664685298 in words is "six hundred sixty-four million, six hundred eighty-five thousand, two hundred ninety-eight".