664791024563 has 4 divisors (see below), whose sum is σ = 664792655640. Its totient is φ = 664789393488.

The previous prime is 664791024551. The next prime is 664791024571. The reversal of 664791024563 is 365420197466.

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 a de Polignac number, because none of the positive numbers 2^k-664791024563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664791021563) 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 3 ways as a sum of consecutive naturals, for example, 381308 + ... + 1214486.

It is an arithmetic number, because the mean of its divisors is an integer number (166198163910).

Almost surely, 2^664791024563 is an apocalyptic number.

664791024563 is a deficient number, since it is larger than the sum of its proper divisors (1631077).

664791024563 is an equidigital number, since it uses as much as digits as its factorization.

664791024563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631076.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 664791024563 in words is "six hundred sixty-four billion, seven hundred ninety-one million, twenty-four thousand, five hundred sixty-three".