6539663 has 8 divisors (see below), whose sum is σ = 7063056. Its totient is φ = 6019200.

The previous prime is 6539647. The next prime is 6539671. The reversal of 6539663 is 3669356.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6539663 - 2⁴ = 6539647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539263) 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, 6983 + ... + 7863.

It is an arithmetic number, because the mean of its divisors is an integer number (882882).

Almost surely, 2^6539663 is an apocalyptic number.

6539663 is a deficient number, since it is larger than the sum of its proper divisors (523393).

6539663 is a wasteful number, since it uses less digits than its factorization.

6539663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465.

The product of its digits is 87480, while the sum is 38.

The square root of 6539663 is about 2557.2764809461. The cubic root of 6539663 is about 187.0043847333.

The spelling of 6539663 in words is "six million, five hundred thirty-nine thousand, six hundred sixty-three".