71800066009 has 4 divisors (see below), whose sum is σ = 82057218304. Its totient is φ = 61542913716.

The previous prime is 71800065937. The next prime is 71800066021. The reversal of 71800066009 is 90066000817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71800066009 - 2¹¹ = 71800063961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71800066309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5128576137 + ... + 5128576150.

It is an arithmetic number, because the mean of its divisors is an integer number (20514304576).

Almost surely, 2^71800066009 is an apocalyptic number.

It is an amenable number.

71800066009 is a deficient number, since it is larger than the sum of its proper divisors (10257152295).

71800066009 is a wasteful number, since it uses less digits than its factorization.

71800066009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10257152294.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 71800066009 in words is "seventy-one billion, eight hundred million, sixty-six thousand, nine".