663538960 has 80 divisors (see below), whose sum is σ = 1839810816. Its totient is φ = 217603584.

The previous prime is 663538927. The next prime is 663538979. The reversal of 663538960 is 69835366.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 663538960.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12879 + ... + 38638.

Almost surely, 2^663538960 is an apocalyptic number.

663538960 is the 12880-th decagonal number.

It is an amenable number.

663538960 is an abundant number, since it is smaller than the sum of its proper divisors (1176271856).

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

663538960 is a wasteful number, since it uses less digits than its factorization.

663538960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51560 (or 51554 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 663538960 is about 25759.2499890816. The cubic root of 663538960 is about 872.2121709677.

The spelling of 663538960 in words is "six hundred sixty-three million, five hundred thirty-eight thousand, nine hundred sixty".