321305305545 has 48 divisors (see below), whose sum is σ = 669990023040. Its totient is φ = 139151768832.

The previous prime is 321305305543. The next prime is 321305305567. The reversal of 321305305545 is 545503503123.

321305305545 is a `hidden beast` number, since 3 + 2 + 1 + 30 + 530 + 55 + 45 = 666.

321305305545 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 321305305545 - 2¹ = 321305305543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321305305543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26836564 + ... + 26848533.

It is an arithmetic number, because the mean of its divisors is an integer number (13958125480).

Almost surely, 2^321305305545 is an apocalyptic number.

321305305545 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

321305305545 is an abundant number, since it is smaller than the sum of its proper divisors (348684717495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321305305545 is a wasteful number, since it uses less digits than its factorization.

321305305545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53685134 (or 53685131 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 36.

Adding to 321305305545 its reverse (545503503123), we get a palindrome (866808808668).

The spelling of 321305305545 in words is "three hundred twenty-one billion, three hundred five million, three hundred five thousand, five hundred forty-five".