320782090897 has 4 divisors (see below), whose sum is σ = 320814408420. Its totient is φ = 320749773376.

The previous prime is 320782090877. The next prime is 320782090901. The reversal of 320782090897 is 798090287023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798090287023 = 463 ⋅1723737121.

It can be written as a sum of positive squares in 2 ways, for example, as 125485269121 + 195296821776 = 354239^2 + 441924^2 .

It is a cyclic number.

It is not a de Polignac number, because 320782090897 - 2¹¹ = 320782088849 is a prime.

It is a super-2 number, since 2×320782090897² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320782090817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16143868 + ... + 16163725.

It is an arithmetic number, because the mean of its divisors is an integer number (80203602105).

Almost surely, 2^320782090897 is an apocalyptic number.

It is an amenable number.

320782090897 is a deficient number, since it is larger than the sum of its proper divisors (32317523).

320782090897 is an equidigital number, since it uses as much as digits as its factorization.

320782090897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32317522.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 320782090897 in words is "three hundred twenty billion, seven hundred eighty-two million, ninety thousand, eight hundred ninety-seven".