663802656 has 96 divisors (see below), whose sum is σ = 1911325248. Its totient is φ = 200048640.

The previous prime is 663802631. The next prime is 663802661. The reversal of 663802656 is 656208366.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×663802656² = 881267932225308672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202180 + ... + 205436.

It is an arithmetic number, because the mean of its divisors is an integer number (19909638).

Almost surely, 2^663802656 is an apocalyptic number.

663802656 is a gapful number since it is divisible by the number (66) 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 663802656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955662624).

663802656 is an abundant number, since it is smaller than the sum of its proper divisors (1247522592).

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

663802656 is a wasteful number, since it uses less digits than its factorization.

663802656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3474 (or 3466 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 663802656 is about 25764.3679526590. The cubic root of 663802656 is about 872.3276971655.

The spelling of 663802656 in words is "six hundred sixty-three million, eight hundred two thousand, six hundred fifty-six".