663958840 has 16 divisors (see below), whose sum is σ = 1493907480. Its totient is φ = 265583520.

The previous prime is 663958807. The next prime is 663958847. The reversal of 663958840 is 48859366.

It is a happy number.

663958840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663958847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8299446 + ... + 8299525.

Almost surely, 2^663958840 is an apocalyptic number.

It is an amenable number.

663958840 is an abundant number, since it is smaller than the sum of its proper divisors (829948640).

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

663958840 is a wasteful number, since it uses less digits than its factorization.

663958840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16598982 (or 16598978 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 663958840 is about 25767.3987821821. The cubic root of 663958840 is about 872.3961075300.

The spelling of 663958840 in words is "six hundred sixty-three million, nine hundred fifty-eight thousand, eight hundred forty".