664513563 has 16 divisors (see below), whose sum is σ = 1021556736. Its totient is φ = 376360320.

The previous prime is 664513559. The next prime is 664513573. The reversal of 664513563 is 365315466.

It is a happy number.

It is not a de Polignac number, because 664513563 - 2² = 664513559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664513513) 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 15 ways as a sum of consecutive naturals, for example, 137643 + ... + 142388.

It is an arithmetic number, because the mean of its divisors is an integer number (63847296).

Almost surely, 2^664513563 is an apocalyptic number.

664513563 is a deficient number, since it is larger than the sum of its proper divisors (357043173).

664513563 is a wasteful number, since it uses less digits than its factorization.

664513563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280154.

The product of its digits is 194400, while the sum is 39.

The square root of 664513563 is about 25778.1605821672. The cubic root of 664513563 is about 872.6389958167.

The spelling of 664513563 in words is "six hundred sixty-four million, five hundred thirteen thousand, five hundred sixty-three".