71768536909 has 4 divisors (see below), whose sum is σ = 73295527104. Its totient is φ = 70241546716.

The previous prime is 71768536891. The next prime is 71768536951. The reversal of 71768536909 is 90963586717.

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 71768536909 - 2¹³ = 71768528717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71768536969) 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, 763495027 + ... + 763495120.

It is an arithmetic number, because the mean of its divisors is an integer number (18323881776).

Almost surely, 2^71768536909 is an apocalyptic number.

It is an amenable number.

71768536909 is a deficient number, since it is larger than the sum of its proper divisors (1526990195).

71768536909 is a wasteful number, since it uses less digits than its factorization.

71768536909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526990194.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 71768536909 in words is "seventy-one billion, seven hundred sixty-eight million, five hundred thirty-six thousand, nine hundred nine".