663000660 has 192 divisors, whose sum is σ = 2412748800. Its totient is φ = 147982464.

The previous prime is 663000619. The next prime is 663000661. The reversal of 663000660 is 66000366.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663000661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 160501 + ... + 164579.

It is an arithmetic number, because the mean of its divisors is an integer number (12566400).

Almost surely, 2^663000660 is an apocalyptic number.

663000660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663000660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1206374400).

663000660 is an abundant number, since it is smaller than the sum of its proper divisors (1749748140).

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

663000660 is a wasteful number, since it uses less digits than its factorization.

663000660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 663000660 is about 25748.7991953023. The cubic root of 663000660 is about 871.9762446885.

The spelling of 663000660 in words is "six hundred sixty-three million, six hundred sixty", and thus it is an aban number.