328243845661 has 2 divisors, whose sum is σ = 328243845662. Its totient is φ = 328243845660.

The previous prime is 328243845617. The next prime is 328243845689. The reversal of 328243845661 is 166548342823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231394671225 + 96849174436 = 481035^2 + 311206^2 .

It is a cyclic number.

It is not a de Polignac number, because 328243845661 - 2²¹ = 328241748509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 328243845599 and 328243845608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328243845691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164121922830 + 164121922831.

It is an arithmetic number, because the mean of its divisors is an integer number (164121922831).

Almost surely, 2^328243845661 is an apocalyptic number.

It is an amenable number.

328243845661 is a deficient number, since it is larger than the sum of its proper divisors (1).

328243845661 is an equidigital number, since it uses as much as digits as its factorization.

328243845661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6635520, while the sum is 52.

The spelling of 328243845661 in words is "three hundred twenty-eight billion, two hundred forty-three million, eight hundred forty-five thousand, six hundred sixty-one".