71617175521 has 2 divisors, whose sum is σ = 71617175522. Its totient is φ = 71617175520.

The previous prime is 71617175507. The next prime is 71617175537. The reversal of 71617175521 is 12557171617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61036173025 + 10581002496 = 247055^2 + 102864^2 .

It is a cyclic number.

It is not a de Polignac number, because 71617175521 - 2⁷ = 71617175393 is a prime.

It is not a weakly prime, because it can be changed into another prime (71617172521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35808587760 + 35808587761.

It is an arithmetic number, because the mean of its divisors is an integer number (35808587761).

Almost surely, 2^71617175521 is an apocalyptic number.

It is an amenable number.

71617175521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71617175521 is an equidigital number, since it uses as much as digits as its factorization.

71617175521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102900, while the sum is 43.

The spelling of 71617175521 in words is "seventy-one billion, six hundred seventeen million, one hundred seventy-five thousand, five hundred twenty-one".