77228818769 has 2 divisors, whose sum is σ = 77228818770. Its totient is φ = 77228818768.

The previous prime is 77228818759. The next prime is 77228818783. The reversal of 77228818769 is 96781882277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75858930625 + 1369888144 = 275425^2 + 37012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77228818769 is a prime.

It is a super-2 number, since 2×77228818769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77228818759) 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, 38614409384 + 38614409385.

It is an arithmetic number, because the mean of its divisors is an integer number (38614409385).

Almost surely, 2^77228818769 is an apocalyptic number.

It is an amenable number.

77228818769 is a deficient number, since it is larger than the sum of its proper divisors (1).

77228818769 is an equidigital number, since it uses as much as digits as its factorization.

77228818769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37933056, while the sum is 65.

The spelling of 77228818769 in words is "seventy-seven billion, two hundred twenty-eight million, eight hundred eighteen thousand, seven hundred sixty-nine".