678000673321 has 2 divisors, whose sum is σ = 678000673322. Its totient is φ = 678000673320.

The previous prime is 678000673319. The next prime is 678000673331. The reversal of 678000673321 is 123376000876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532695619600 + 145305053721 = 729860^2 + 381189^2 .

It is a cyclic number.

It is not a de Polignac number, because 678000673321 - 2¹ = 678000673319 is a prime.

It is a super-2 number, since 2×678000673321² (a number of 24 digits) contains 22 as substring.

Together with 678000673319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (678000673331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339000336660 + 339000336661.

It is an arithmetic number, because the mean of its divisors is an integer number (339000336661).

Almost surely, 2^678000673321 is an apocalyptic number.

It is an amenable number.

678000673321 is a deficient number, since it is larger than the sum of its proper divisors (1).

678000673321 is an equidigital number, since it uses as much as digits as its factorization.

678000673321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 43.

The spelling of 678000673321 in words is "six hundred seventy-eight billion, six hundred seventy-three thousand, three hundred twenty-one".