663441640 has 32 divisors (see below), whose sum is σ = 1504150560. Its totient is φ = 263348800.

The previous prime is 663441631. The next prime is 663441697. The reversal of 663441640 is 46144366.

It is a junction number, because it is equal to n+sod(n) for n = 663441596 and 663441605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58066 + ... + 68545.

It is an arithmetic number, because the mean of its divisors is an integer number (47004705).

Almost surely, 2^663441640 is an apocalyptic number.

It is an amenable number.

663441640 is an abundant number, since it is smaller than the sum of its proper divisors (840708920).

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

663441640 is a wasteful number, since it uses less digits than its factorization.

663441640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126753 (or 126749 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 663441640 is about 25757.3608896564. The cubic root of 663441640 is about 872.1695269815.

The spelling of 663441640 in words is "six hundred sixty-three million, four hundred forty-one thousand, six hundred forty".