320563420555 has 32 divisors (see below), whose sum is σ = 446339257344. Its totient is φ = 216462381696.

The previous prime is 320563420519. The next prime is 320563420603. The reversal of 320563420555 is 555024365023.

It is a cyclic number.

It is not a de Polignac number, because 320563420555 - 2⁷ = 320563420427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7607274 + ... + 7649296.

It is an arithmetic number, because the mean of its divisors is an integer number (13948101792).

Almost surely, 2^320563420555 is an apocalyptic number.

320563420555 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

320563420555 is a deficient number, since it is larger than the sum of its proper divisors (125775836789).

320563420555 is a wasteful number, since it uses less digits than its factorization.

320563420555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45355.

The product of its (nonzero) digits is 540000, while the sum is 40.

Adding to 320563420555 its reverse (555024365023), we get a palindrome (875587785578).

The spelling of 320563420555 in words is "three hundred twenty billion, five hundred sixty-three million, four hundred twenty thousand, five hundred fifty-five".