678328486081 has 2 divisors, whose sum is σ = 678328486082. Its totient is φ = 678328486080.

The previous prime is 678328486063. The next prime is 678328486097. The reversal of 678328486081 is 180684823876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615369647025 + 62958839056 = 784455^2 + 250916^2 .

It is a cyclic number.

It is not a de Polignac number, because 678328486081 - 2¹¹ = 678328484033 is a prime.

It is a super-2 number, since 2×678328486081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678328486051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339164243040 + 339164243041.

It is an arithmetic number, because the mean of its divisors is an integer number (339164243041).

Almost surely, 2^678328486081 is an apocalyptic number.

It is an amenable number.

678328486081 is a deficient number, since it is larger than the sum of its proper divisors (1).

678328486081 is an equidigital number, since it uses as much as digits as its factorization.

678328486081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24772608, while the sum is 61.

The spelling of 678328486081 in words is "six hundred seventy-eight billion, three hundred twenty-eight million, four hundred eighty-six thousand, eighty-one".