663576816 has 120 divisors (see below), whose sum is σ = 2002788480. Its totient is φ = 188770176.

The previous prime is 663576773. The next prime is 663576821. The reversal of 663576816 is 618675366.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 721605 + ... + 722523.

It is an arithmetic number, because the mean of its divisors is an integer number (16689904).

Almost surely, 2^663576816 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 663576816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1001394240).

663576816 is an abundant number, since it is smaller than the sum of its proper divisors (1339211664).

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

663576816 is a wasteful number, since it uses less digits than its factorization.

663576816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1238 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The square root of 663576816 is about 25759.9847826042. The cubic root of 663576816 is about 872.2287577034.

The spelling of 663576816 in words is "six hundred sixty-three million, five hundred seventy-six thousand, eight hundred sixteen".