663221452 has 24 divisors (see below), whose sum is σ = 1169532000. Its totient is φ = 329079936.

The previous prime is 663221441. The next prime is 663221473. The reversal of 663221452 is 254122366.

It is an unprimeable number.

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, 324249 + ... + 326287.

It is an arithmetic number, because the mean of its divisors is an integer number (48730500).

Almost surely, 2^663221452 is an apocalyptic number.

It is an amenable number.

663221452 is a deficient number, since it is larger than the sum of its proper divisors (506310548).

663221452 is a wasteful number, since it uses less digits than its factorization.

663221452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625 (or 2623 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 663221452 is about 25753.0862616503. The cubic root of 663221452 is about 872.0730289117.

The spelling of 663221452 in words is "six hundred sixty-three million, two hundred twenty-one thousand, four hundred fifty-two".