320456935518721 has 3 divisors (see below), whose sum is σ = 320456953420033. Its totient is φ = 320456917617410.

The previous prime is 320456935518703. The next prime is 320456935518739. The reversal of 320456935518721 is 127815539654023.

The square root of 320456935518721 is 17901311.

It is a perfect power (a square), and thus also a powerful number.

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 an interprime number because it is at equal distance from previous prime (320456935518703) and next prime (320456935518739).

It is not a de Polignac number, because 320456935518721 - 2¹⁷ = 320456935387649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320456935518721.

It is not an unprimeable number, because it can be changed into a prime (320456935518521) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8950656 + ... + 26851966.

It is a 1-persistent number, because it is pandigital, but 2⋅320456935518721 = 640913871037442 is not.

Almost surely, 2^{320456935518721} is an apocalyptic number.

320456935518721 is the 17901311-st square number.

320456935518721 is the 8950656-th centered octagonal number.

It is an amenable number.

320456935518721 is a deficient number, since it is larger than the sum of its proper divisors (17901312).

320456935518721 is an frugal number, since it uses more digits than its factorization.

320456935518721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35802622 (or 17901311 counting only the distinct ones).

The product of its (nonzero) digits is 54432000, while the sum is 61.

The spelling of 320456935518721 in words is "three hundred twenty trillion, four hundred fifty-six billion, nine hundred thirty-five million, five hundred eighteen thousand, seven hundred twenty-one".