71505144413 has 2 divisors, whose sum is σ = 71505144414. Its totient is φ = 71505144412.

The previous prime is 71505144349. The next prime is 71505144419. The reversal of 71505144413 is 31444150517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63424392964 + 8080751449 = 251842^2 + 89893^2 .

It is a cyclic number.

It is not a de Polignac number, because 71505144413 - 2⁶ = 71505144349 is a prime.

It is a super-2 number, since 2×71505144413² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71505144419) 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, 35752572206 + 35752572207.

It is an arithmetic number, because the mean of its divisors is an integer number (35752572207).

Almost surely, 2^71505144413 is an apocalyptic number.

It is an amenable number.

71505144413 is a deficient number, since it is larger than the sum of its proper divisors (1).

71505144413 is an equidigital number, since it uses as much as digits as its factorization.

71505144413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 71505144413 in words is "seventy-one billion, five hundred five million, one hundred forty-four thousand, four hundred thirteen".