663387539 has 4 divisors (see below), whose sum is σ = 663439056. Its totient is φ = 663336024.

The previous prime is 663387521. The next prime is 663387607. The reversal of 663387539 is 935783366.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 663387539 - 2¹⁶ = 663322003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663387509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12437 + ... + 38489.

It is an arithmetic number, because the mean of its divisors is an integer number (165859764).

Almost surely, 2^663387539 is an apocalyptic number.

663387539 is a deficient number, since it is larger than the sum of its proper divisors (51517).

663387539 is a wasteful number, since it uses less digits than its factorization.

663387539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51516.

The product of its digits is 2449440, while the sum is 50.

The square root of 663387539 is about 25756.3106636024. The cubic root of 663387539 is about 872.1458190302.

The spelling of 663387539 in words is "six hundred sixty-three million, three hundred eighty-seven thousand, five hundred thirty-nine".