71144380777 has 2 divisors, whose sum is σ = 71144380778. Its totient is φ = 71144380776.

The previous prime is 71144380753. The next prime is 71144380793. The reversal of 71144380777 is 77708344117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43087795776 + 28056585001 = 207576^2 + 167501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71144380777 is a prime.

It is a super-2 number, since 2×71144380777² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71144380777.

It is not a weakly prime, because it can be changed into another prime (71144380717) 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, 35572190388 + 35572190389.

It is an arithmetic number, because the mean of its divisors is an integer number (35572190389).

Almost surely, 2^71144380777 is an apocalyptic number.

It is an amenable number.

71144380777 is a deficient number, since it is larger than the sum of its proper divisors (1).

71144380777 is an equidigital number, since it uses as much as digits as its factorization.

71144380777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 921984, while the sum is 49.

The spelling of 71144380777 in words is "seventy-one billion, one hundred forty-four million, three hundred eighty thousand, seven hundred seventy-seven".