663111968256 has 320 divisors, whose sum is σ = 2134518471360. Its totient is φ = 202409902080.

The previous prime is 663111968237. The next prime is 663111968261. The reversal of 663111968256 is 652869111366.

663111968256 is a `hidden beast` number, since 6 + 6 + 311 + 19 + 68 + 256 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8657166 + ... + 8733426.

It is an arithmetic number, because the mean of its divisors is an integer number (6670370223).

Almost surely, 2^663111968256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663111968256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067259235680).

663111968256 is an abundant number, since it is smaller than the sum of its proper divisors (1471406503104).

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

663111968256 is a wasteful number, since it uses less digits than its factorization.

663111968256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76342 (or 76320 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 663111968256 in words is "six hundred sixty-three billion, one hundred eleven million, nine hundred sixty-eight thousand, two hundred fifty-six".