663381980 has 24 divisors (see below), whose sum is σ = 1396337712. Its totient is φ = 264736512.

The previous prime is 663381967. The next prime is 663382003. The reversal of 663381980 is 89183366.

It is a congruent number.

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, 29642 + ... + 46961.

It is an arithmetic number, because the mean of its divisors is an integer number (58180738).

Almost surely, 2^663381980 is an apocalyptic number.

It is an amenable number.

663381980 is an abundant number, since it is smaller than the sum of its proper divisors (732955732).

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

663381980 is a wasteful number, since it uses less digits than its factorization.

663381980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77045 (or 77043 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 663381980 is about 25756.2027480760. The cubic root of 663381980 is about 872.1433829116.

The spelling of 663381980 in words is "six hundred sixty-three million, three hundred eighty-one thousand, nine hundred eighty".