328388255981 has 2 divisors, whose sum is σ = 328388255982. Its totient is φ = 328388255980.

The previous prime is 328388255977. The next prime is 328388256011. The reversal of 328388255981 is 189552883823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311485655881 + 16902600100 = 558109^2 + 130010^2 .

It is a cyclic number.

It is not a de Polignac number, because 328388255981 - 2² = 328388255977 is a prime.

It is a super-2 number, since 2×328388255981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328388255081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164194127990 + 164194127991.

It is an arithmetic number, because the mean of its divisors is an integer number (164194127991).

Almost surely, 2^328388255981 is an apocalyptic number.

It is an amenable number.

328388255981 is a deficient number, since it is larger than the sum of its proper divisors (1).

328388255981 is an equidigital number, since it uses as much as digits as its factorization.

328388255981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33177600, while the sum is 62.

The spelling of 328388255981 in words is "three hundred twenty-eight billion, three hundred eighty-eight million, two hundred fifty-five thousand, nine hundred eighty-one".