77348865181 has 6 divisors (see below), whose sum is σ = 89977251390. Its totient is φ = 66299027256.

The previous prime is 77348865169. The next prime is 77348865211. The reversal of 77348865181 is 18156884377.

It can be written as a sum of positive squares in only one way, i.e., 66946905081 + 10401960100 = 258741^2 + 101990^2 .

It is not a de Polignac number, because 77348865181 - 2¹⁵ = 77348832413 is a prime.

It is a super-2 number, since 2×77348865181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77348869181) 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 in 5 ways as a sum of consecutive naturals, for example, 789274086 + ... + 789274183.

It is an arithmetic number, because the mean of its divisors is an integer number (14996208565).

Almost surely, 2^77348865181 is an apocalyptic number.

It is an amenable number.

77348865181 is a deficient number, since it is larger than the sum of its proper divisors (12628386209).

77348865181 is a wasteful number, since it uses less digits than its factorization.

77348865181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578548283 (or 1578548276 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 58.

The spelling of 77348865181 in words is "seventy-seven billion, three hundred forty-eight million, eight hundred sixty-five thousand, one hundred eighty-one".