320546746549 has 2 divisors, whose sum is σ = 320546746550. Its totient is φ = 320546746548.

The previous prime is 320546746537. The next prime is 320546746567. The reversal of 320546746549 is 945647645023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306382176324 + 14164570225 = 553518^2 + 119015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320546746549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320546746549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320546746519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160273373274 + 160273373275.

It is an arithmetic number, because the mean of its divisors is an integer number (160273373275).

Almost surely, 2^320546746549 is an apocalyptic number.

It is an amenable number.

320546746549 is a deficient number, since it is larger than the sum of its proper divisors (1).

320546746549 is an equidigital number, since it uses as much as digits as its factorization.

320546746549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21772800, while the sum is 55.

The spelling of 320546746549 in words is "three hundred twenty billion, five hundred forty-six million, seven hundred forty-six thousand, five hundred forty-nine".