78789898777 has 2 divisors, whose sum is σ = 78789898778. Its totient is φ = 78789898776.

The previous prime is 78789898771. The next prime is 78789898807. The reversal of 78789898777 is 77789898787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78577059856 + 212838921 = 280316^2 + 14589^2 .

It is a cyclic number.

It is not a de Polignac number, because 78789898777 - 2²³ = 78781510169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78789898694 and 78789898703.

It is not a weakly prime, because it can be changed into another prime (78789898771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39394949388 + 39394949389.

It is an arithmetic number, because the mean of its divisors is an integer number (39394949389).

Almost surely, 2^78789898777 is an apocalyptic number.

It is an amenable number.

78789898777 is a deficient number, since it is larger than the sum of its proper divisors (1).

78789898777 is an equidigital number, since it uses as much as digits as its factorization.

78789898777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5576159232, while the sum is 85.

The spelling of 78789898777 in words is "seventy-eight billion, seven hundred eighty-nine million, eight hundred ninety-eight thousand, seven hundred seventy-seven".