77746168889 has 2 divisors, whose sum is σ = 77746168890. Its totient is φ = 77746168888.

The previous prime is 77746168879. The next prime is 77746168919. The reversal of 77746168889 is 98886164777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75181252864 + 2564916025 = 274192^2 + 50645^2 .

It is an emirp because it is prime and its reverse (98886164777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77746168889 - 2¹⁶ = 77746103353 is a prime.

It is a super-2 number, since 2×77746168889² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77746168879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38873084444 + 38873084445.

It is an arithmetic number, because the mean of its divisors is an integer number (38873084445).

Almost surely, 2^77746168889 is an apocalyptic number.

It is an amenable number.

77746168889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77746168889 is an equidigital number, since it uses as much as digits as its factorization.

77746168889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 227598336, while the sum is 71.

The spelling of 77746168889 in words is "seventy-seven billion, seven hundred forty-six million, one hundred sixty-eight thousand, eight hundred eighty-nine".