320043521425 has 6 divisors (see below), whose sum is σ = 396853966598. Its totient is φ = 256034817120.

The previous prime is 320043521387. The next prime is 320043521429. The reversal of 320043521425 is 524125340023.

It can be written as a sum of positive squares in 3 ways, for example, as 38604783361 + 281438738064 = 196481^2 + 530508^2 .

It is not a de Polignac number, because 320043521425 - 2¹³ = 320043513233 is a prime.

It is a super-2 number, since 2×320043521425² (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 (320043521429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6400870404 + ... + 6400870453.

Almost surely, 2^320043521425 is an apocalyptic number.

It is an amenable number.

320043521425 is a deficient number, since it is larger than the sum of its proper divisors (76810445173).

320043521425 is a wasteful number, since it uses less digits than its factorization.

320043521425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12801740867 (or 12801740862 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 320043521425 its reverse (524125340023), we get a palindrome (844168861448).

The spelling of 320043521425 in words is "three hundred twenty billion, forty-three million, five hundred twenty-one thousand, four hundred twenty-five".