6509663 has 4 divisors (see below), whose sum is σ = 6515808. Its totient is φ = 6503520.

The previous prime is 6509617. The next prime is 6509677. The reversal of 6509663 is 3669056.

6509663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6509663 - 2¹⁸ = 6247519 is a prime.

It is a d-powerful number, because it can be written as 6³ + 5³ + 0 + 9² + 6⁶ + 6⁸ + 3¹⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6509603) 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 3 ways as a sum of consecutive naturals, for example, 1031 + ... + 3752.

It is an arithmetic number, because the mean of its divisors is an integer number (1628952).

Almost surely, 2^6509663 is an apocalyptic number.

6509663 is a deficient number, since it is larger than the sum of its proper divisors (6145).

6509663 is a wasteful number, since it uses less digits than its factorization.

6509663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6144.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 6509663 is about 2551.4041232231. The cubic root of 6509663 is about 186.7179921930.

The spelling of 6509663 in words is "six million, five hundred nine thousand, six hundred sixty-three".