663188660 has 24 divisors (see below), whose sum is σ = 1394053416. Its totient is φ = 265016960.

The previous prime is 663188651. The next prime is 663188663. The reversal of 663188660 is 66881366.

It can be written as a sum of positive squares in 4 ways, for example, as 131148304 + 532040356 = 11452^2 + 23066^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663188663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5594 + ... + 36846.

It is an arithmetic number, because the mean of its divisors is an integer number (58085559).

Almost surely, 2^663188660 is an apocalyptic number.

It is an amenable number.

663188660 is an abundant number, since it is smaller than the sum of its proper divisors (730864756).

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

663188660 is a wasteful number, since it uses less digits than its factorization.

663188660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32323 (or 32321 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 663188660 is about 25752.4495922233. The cubic root of 663188660 is about 872.0586558894.

The spelling of 663188660 in words is "six hundred sixty-three million, one hundred eighty-eight thousand, six hundred sixty".