663451878960 has 480 divisors, whose sum is σ = 2430844416000. Its totient is φ = 161190881280.

The previous prime is 663451878937. The next prime is 663451878967. The reversal of 663451878960 is 69878154366.

663451878960 is a `hidden beast` number, since 6 + 6 + 34 + 518 + 7 + 89 + 6 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (663451878967) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 244004481 + ... + 244007199.

It is an arithmetic number, because the mean of its divisors is an integer number (5064259200).

Almost surely, 2^663451878960 is an apocalyptic number.

663451878960 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 663451878960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1215422208000).

663451878960 is an abundant number, since it is smaller than the sum of its proper divisors (1767392537040).

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

663451878960 is a wasteful number, since it uses less digits than its factorization.

663451878960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081 (or 3072 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 663451878960 in words is "six hundred sixty-three billion, four hundred fifty-one million, eight hundred seventy-eight thousand, nine hundred sixty".