663910055424 has 1280 divisors, whose sum is σ = 2732225126400. Its totient is φ = 153678643200.

The previous prime is 663910055399. The next prime is 663910055483. The reversal of 663910055424 is 424550019366.

663910055424 is a `hidden beast` number, since 6 + 6 + 3 + 91 + 0 + 0 + 554 + 2 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 663910055424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 343815739 + ... + 343817669.

It is an arithmetic number, because the mean of its divisors is an integer number (2134550880).

Almost surely, 2^663910055424 is an apocalyptic number.

663910055424 is a gapful number since it is divisible by the number (64) 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 663910055424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1366112563200).

663910055424 is an abundant number, since it is smaller than the sum of its proper divisors (2068315070976).

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

663910055424 is a wasteful number, since it uses less digits than its factorization.

663910055424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 1990 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 663910055424 in words is "six hundred sixty-three billion, nine hundred ten million, fifty-five thousand, four hundred twenty-four".