71125897727477 has 2 divisors, whose sum is σ = 71125897727478. Its totient is φ = 71125897727476.

The previous prime is 71125897727447. The next prime is 71125897727497. The reversal of 71125897727477 is 77472779852117.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70158062833681 + 967834893796 = 8376041^2 + 983786^2 .

It is a cyclic number.

It is not a de Polignac number, because 71125897727477 - 2³⁸ = 70851019820533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71125897727447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35562948863738 + 35562948863739.

It is an arithmetic number, because the mean of its divisors is an integer number (35562948863739).

Almost surely, 2^{71125897727477} is an apocalyptic number.

It is an amenable number.

71125897727477 is a deficient number, since it is larger than the sum of its proper divisors (1).

71125897727477 is an equidigital number, since it uses as much as digits as its factorization.

71125897727477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677658240, while the sum is 74.

The spelling of 71125897727477 in words is "seventy-one trillion, one hundred twenty-five billion, eight hundred ninety-seven million, seven hundred twenty-seven thousand, four hundred seventy-seven".