320561445723315 has 32 divisors (see below), whose sum is σ = 520457150255616. Its totient is φ = 168449593105920.

The previous prime is 320561445723313. The next prime is 320561445723361. The reversal of 320561445723315 is 513327544165023.

It is not a de Polignac number, because 320561445723315 - 2¹ = 320561445723313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320561445723313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95254189 + ... + 98562078.

It is an arithmetic number, because the mean of its divisors is an integer number (16264285945488).

Almost surely, 2^{320561445723315} is an apocalyptic number.

320561445723315 is a deficient number, since it is larger than the sum of its proper divisors (199895704532301).

320561445723315 is a wasteful number, since it uses less digits than its factorization.

320561445723315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193817899.

The product of its (nonzero) digits is 9072000, while the sum is 51.

Adding to 320561445723315 its reverse (513327544165023), we get a palindrome (833888989888338).

The spelling of 320561445723315 in words is "three hundred twenty trillion, five hundred sixty-one billion, four hundred forty-five million, seven hundred twenty-three thousand, three hundred fifteen".