320520611506 has 8 divisors (see below), whose sum is σ = 509062147740. Its totient is φ = 150833228928.

The previous prime is 320520611479. The next prime is 320520611519. The reversal of 320520611506 is 605116025023.

It can be written as a sum of positive squares in 2 ways, for example, as 240287216481 + 80233395025 = 490191^2 + 283255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4713538371 + ... + 4713538438.

Almost surely, 2^320520611506 is an apocalyptic number.

320520611506 is a deficient number, since it is larger than the sum of its proper divisors (188541536234).

320520611506 is a wasteful number, since it uses less digits than its factorization.

320520611506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427076828.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 320520611506 its reverse (605116025023), we get a palindrome (925636636529).

The spelling of 320520611506 in words is "three hundred twenty billion, five hundred twenty million, six hundred eleven thousand, five hundred six".