663499538 has 16 divisors (see below), whose sum is σ = 1118408256. Its totient is φ = 292915920.

The previous prime is 663499537. The next prime is 663499547. The reversal of 663499538 is 835994366.

It is a self number, because there is not a number n which added to its sum of digits gives 663499538.

It is not an unprimeable number, because it can be changed into a prime (663499531) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 554168 + ... + 555363.

It is an arithmetic number, because the mean of its divisors is an integer number (69900516).

Almost surely, 2^663499538 is an apocalyptic number.

663499538 is a deficient number, since it is larger than the sum of its proper divisors (454908718).

663499538 is a wasteful number, since it uses less digits than its factorization.

663499538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109569.

The product of its digits is 4199040, while the sum is 53.

The square root of 663499538 is about 25758.4847768653. The cubic root of 663499538 is about 872.1948974132.

The spelling of 663499538 in words is "six hundred sixty-three million, four hundred ninety-nine thousand, five hundred thirty-eight".