71003536721 has 16 divisors (see below), whose sum is σ = 76836819024. Its totient is φ = 65223819264.

The previous prime is 71003536717. The next prime is 71003536733. The reversal of 71003536721 is 12763530017.

It can be written as a sum of positive squares in 8 ways, for example, as 523906321 + 70479630400 = 22889^2 + 265480^2 .

It is a cyclic number.

It is not a de Polignac number, because 71003536721 - 2² = 71003536717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71003536771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3655391 + ... + 3674763.

It is an arithmetic number, because the mean of its divisors is an integer number (4802301189).

Almost surely, 2^71003536721 is an apocalyptic number.

It is an amenable number.

71003536721 is a deficient number, since it is larger than the sum of its proper divisors (5833282303).

71003536721 is a wasteful number, since it uses less digits than its factorization.

71003536721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20740.

The product of its (nonzero) digits is 26460, while the sum is 35.

The spelling of 71003536721 in words is "seventy-one billion, three million, five hundred thirty-six thousand, seven hundred twenty-one".