663212560 has 40 divisors (see below), whose sum is σ = 1543483800. Its totient is φ = 265024512.

The previous prime is 663212533. The next prime is 663212587. The reversal of 663212560 is 65212366.

It is an interprime number because it is at equal distance from previous prime (663212533) and next prime (663212587).

It can be written as a sum of positive squares in 4 ways, for example, as 175509504 + 487703056 = 13248^2 + 22084^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91966 + ... + 98914.

It is an arithmetic number, because the mean of its divisors is an integer number (38587095).

Almost surely, 2^663212560 is an apocalyptic number.

It is an amenable number.

663212560 is an abundant number, since it is smaller than the sum of its proper divisors (880271240).

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

663212560 is a wasteful number, since it uses less digits than its factorization.

663212560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8155 (or 8149 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 663212560 is about 25752.9136215691. The cubic root of 663212560 is about 872.0691315166.

The spelling of 663212560 in words is "six hundred sixty-three million, two hundred twelve thousand, five hundred sixty".