664231563 has 16 divisors (see below), whose sum is σ = 1002615840. Its totient is φ = 434464992.

The previous prime is 664231541. The next prime is 664231567. The reversal of 664231563 is 365132466.

664231563 is a `hidden beast` number, since 6 + 64 + 2 + 31 + 563 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-664231563 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (664231567) 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, 230656 + ... + 233517.

It is an arithmetic number, because the mean of its divisors is an integer number (62663490).

Almost surely, 2^664231563 is an apocalyptic number.

664231563 is a deficient number, since it is larger than the sum of its proper divisors (338384277).

664231563 is a wasteful number, since it uses less digits than its factorization.

664231563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464235 (or 464229 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 664231563 is about 25772.6902553847. The cubic root of 664231563 is about 872.5155375815.

The spelling of 664231563 in words is "six hundred sixty-four million, two hundred thirty-one thousand, five hundred sixty-three".