663873085440 has 336 divisors, whose sum is σ = 2380679262000. Its totient is φ = 170925490176.

The previous prime is 663873085397. The next prime is 663873085481. The reversal of 663873085440 is 44580378366.

663873085440 is a `hidden beast` number, since 6 + 63 + 8 + 7 + 30 + 8 + 544 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10659511 + ... + 10721609.

Almost surely, 2^663873085440 is an apocalyptic number.

663873085440 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 663873085440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190339631000).

663873085440 is an abundant number, since it is smaller than the sum of its proper divisors (1716806176560).

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

663873085440 is a wasteful number, since it uses less digits than its factorization.

663873085440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62165 (or 62138 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 663873085440 in words is "six hundred sixty-three billion, eight hundred seventy-three million, eighty-five thousand, four hundred forty".