320556434223664 has 80 divisors (see below), whose sum is σ = 633599891252640. Its totient is φ = 157064125317120.

The previous prime is 320556434223661. The next prime is 320556434223667. The reversal of 320556434223664 is 466322434655023.

It is an interprime number because it is at equal distance from previous prime (320556434223661) and next prime (320556434223667).

It is not an unprimeable number, because it can be changed into a prime (320556434223661) 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, 1715570884 + ... + 1715757724.

It is an arithmetic number, because the mean of its divisors is an integer number (7919998640658).

Almost surely, 2^{320556434223664} is an apocalyptic number.

It is an amenable number.

320556434223664 is a deficient number, since it is larger than the sum of its proper divisors (313043457028976).

320556434223664 is a wasteful number, since it uses less digits than its factorization.

320556434223664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192638 (or 192632 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 55.

Adding to 320556434223664 its reverse (466322434655023), we get a palindrome (786878868878687).

The spelling of 320556434223664 in words is "three hundred twenty trillion, five hundred fifty-six billion, four hundred thirty-four million, two hundred twenty-three thousand, six hundred sixty-four".