663918840360 has 256 divisors, whose sum is σ = 2236021920000. Its totient is φ = 175217541120.

The previous prime is 663918840337. The next prime is 663918840373. The reversal of 663918840360 is 63048819366.

663918840360 is a `hidden beast` number, since 6 + 63 + 9 + 188 + 40 + 360 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 663918840297 and 663918840306.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42417816 + ... + 42433464.

It is an arithmetic number, because the mean of its divisors is an integer number (8734460625).

Almost surely, 2^663918840360 is an apocalyptic number.

663918840360 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 663918840360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1118010960000).

663918840360 is an abundant number, since it is smaller than the sum of its proper divisors (1572103079640).

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

663918840360 is a wasteful number, since it uses less digits than its factorization.

663918840360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16073 (or 16063 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 663918840360 in words is "six hundred sixty-three billion, nine hundred eighteen million, eight hundred forty thousand, three hundred sixty".