663755880 has 128 divisors (see below), whose sum is σ = 2163916800. Its totient is φ = 162259200.

The previous prime is 663755879. The next prime is 663755881. The reversal of 663755880 is 88557366.

It is an interprime number because it is at equal distance from previous prime (663755879) and next prime (663755881).

It is not an unprimeable number, because it can be changed into a prime (663755881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65985 + ... + 75375.

It is an arithmetic number, because the mean of its divisors is an integer number (16905600).

Almost surely, 2^663755880 is an apocalyptic number.

663755880 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 663755880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081958400).

663755880 is an abundant number, since it is smaller than the sum of its proper divisors (1500160920).

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

663755880 is a wasteful number, since it uses less digits than its factorization.

663755880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9455 (or 9451 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The square root of 663755880 is about 25763.4601713357. The cubic root of 663755880 is about 872.3072066586.

The spelling of 663755880 in words is "six hundred sixty-three million, seven hundred fifty-five thousand, eight hundred eighty".