320505403351 has 24 divisors (see below), whose sum is σ = 391080075264. Its totient is φ = 261398657520.

The previous prime is 320505403301. The next prime is 320505403367. The reversal of 320505403351 is 153304505023.

It is not a de Polignac number, because 320505403351 - 2¹⁹ = 320504879063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320505403301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 529215 + ... + 959728.

It is an arithmetic number, because the mean of its divisors is an integer number (16295003136).

Almost surely, 2^320505403351 is an apocalyptic number.

320505403351 is a deficient number, since it is larger than the sum of its proper divisors (70574671913).

320505403351 is a wasteful number, since it uses less digits than its factorization.

320505403351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489171 (or 1489164 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 31.

Adding to 320505403351 its reverse (153304505023), we get a palindrome (473809908374).

The spelling of 320505403351 in words is "three hundred twenty billion, five hundred five million, four hundred three thousand, three hundred fifty-one".