71809894707009 has 16 divisors (see below), whose sum is σ = 95791293002304. Its totient is φ = 47850884979200.

The previous prime is 71809894707007. The next prime is 71809894707029. The reversal of 71809894707009 is 90070749890817.

It is a cyclic number.

It is not a de Polignac number, because 71809894707009 - 2¹ = 71809894707007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71809894707007) 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 in 15 ways as a sum of consecutive naturals, for example, 54915229 + ... + 56207669.

It is an arithmetic number, because the mean of its divisors is an integer number (5986955812644).

Almost surely, 2^{71809894707009} is an apocalyptic number.

It is an amenable number.

71809894707009 is a deficient number, since it is larger than the sum of its proper divisors (23981398295295).

71809894707009 is a wasteful number, since it uses less digits than its factorization.

71809894707009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301088.

The product of its (nonzero) digits is 64012032, while the sum is 69.

The spelling of 71809894707009 in words is "seventy-one trillion, eight hundred nine billion, eight hundred ninety-four million, seven hundred seven thousand, nine".