320331506545 has 8 divisors (see below), whose sum is σ = 394786938024. Its totient is φ = 249339118464.

The previous prime is 320331506513. The next prime is 320331506587. The reversal of 320331506545 is 545605133023.

It can be written as a sum of positive squares in 4 ways, for example, as 92335761424 + 227995745121 = 303868^2 + 477489^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 320331506545 - 2⁵ = 320331506513 is a prime.

It is a super-2 number, since 2×320331506545² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865760644 + ... + 865761013.

It is an arithmetic number, because the mean of its divisors is an integer number (49348367253).

Almost surely, 2^320331506545 is an apocalyptic number.

It is an amenable number.

320331506545 is a deficient number, since it is larger than the sum of its proper divisors (74455431479).

320331506545 is a wasteful number, since it uses less digits than its factorization.

320331506545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731521699.

The product of its (nonzero) digits is 162000, while the sum is 37.

Adding to 320331506545 its reverse (545605133023), we get a palindrome (865936639568).

The spelling of 320331506545 in words is "three hundred twenty billion, three hundred thirty-one million, five hundred six thousand, five hundred forty-five".