1678505677789 has 2 divisors, whose sum is σ = 1678505677790. Its totient is φ = 1678505677788.

The previous prime is 1678505677699. The next prime is 1678505677837. The reversal of 1678505677789 is 9877765058761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1472994868900 + 205510808889 = 1213670^2 + 453333^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678505677789 - 2¹¹ = 1678505675741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678505627789) 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, 839252838894 + 839252838895.

It is an arithmetic number, because the mean of its divisors is an integer number (839252838895).

Almost surely, 2^{1678505677789} is an apocalyptic number.

It is an amenable number.

1678505677789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678505677789 is an equidigital number, since it uses as much as digits as its factorization.

1678505677789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244678400, while the sum is 76.

The spelling of 1678505677789 in words is "one trillion, six hundred seventy-eight billion, five hundred five million, six hundred seventy-seven thousand, seven hundred eighty-nine".