77187127841 has 2 divisors, whose sum is σ = 77187127842. Its totient is φ = 77187127840.

The previous prime is 77187127799. The next prime is 77187127903. The reversal of 77187127841 is 14872178177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59375556241 + 17811571600 = 243671^2 + 133460^2 .

It is an emirp because it is prime and its reverse (14872178177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77187127841 - 2²⁶ = 77120018977 is a prime.

It is not a weakly prime, because it can be changed into another prime (77187127741) 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, 38593563920 + 38593563921.

It is an arithmetic number, because the mean of its divisors is an integer number (38593563921).

Almost surely, 2^77187127841 is an apocalyptic number.

It is an amenable number.

77187127841 is a deficient number, since it is larger than the sum of its proper divisors (1).

77187127841 is an equidigital number, since it uses as much as digits as its factorization.

77187127841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1229312, while the sum is 53.

The spelling of 77187127841 in words is "seventy-seven billion, one hundred eighty-seven million, one hundred twenty-seven thousand, eight hundred forty-one".