678767641789 has 2 divisors, whose sum is σ = 678767641790. Its totient is φ = 678767641788.

The previous prime is 678767641781. The next prime is 678767641807. The reversal of 678767641789 is 987146767876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628980644889 + 49786996900 = 793083^2 + 223130^2 .

It is a cyclic number.

It is not a de Polignac number, because 678767641789 - 2³ = 678767641781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678767641781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339383820894 + 339383820895.

It is an arithmetic number, because the mean of its divisors is an integer number (339383820895).

Almost surely, 2^678767641789 is an apocalyptic number.

It is an amenable number.

678767641789 is a deficient number, since it is larger than the sum of its proper divisors (1).

678767641789 is an equidigital number, since it uses as much as digits as its factorization.

678767641789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1194891264, while the sum is 76.

The spelling of 678767641789 in words is "six hundred seventy-eight billion, seven hundred sixty-seven million, six hundred forty-one thousand, seven hundred eighty-nine".