664234563 has 16 divisors (see below), whose sum is σ = 916616736. Its totient is φ = 427560960.

The previous prime is 664234513. The next prime is 664234579. The reversal of 664234563 is 365432466.

It is not a de Polignac number, because 664234563 - 2²⁰ = 663185987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664234513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15906 + ... + 39767.

It is an arithmetic number, because the mean of its divisors is an integer number (57288546).

Almost surely, 2^664234563 is an apocalyptic number.

664234563 is a deficient number, since it is larger than the sum of its proper divisors (252382173).

664234563 is a wasteful number, since it uses less digits than its factorization.

664234563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55814.

The product of its digits is 311040, while the sum is 39.

The square root of 664234563 is about 25772.7484564608. The cubic root of 664234563 is about 872.5168511509.

The spelling of 664234563 in words is "six hundred sixty-four million, two hundred thirty-four thousand, five hundred sixty-three".