71720767011 has 4 divisors (see below), whose sum is σ = 95627689352. Its totient is φ = 47813844672.

The previous prime is 71720766983. The next prime is 71720767051. The reversal of 71720767011 is 11076702717.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 71720767011 - 2¹⁷ = 71720635939 is a prime.

It is a super-2 number, since 2×71720767011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71720767051) 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, 11953461166 + ... + 11953461171.

It is an arithmetic number, because the mean of its divisors is an integer number (23906922338).

Almost surely, 2^71720767011 is an apocalyptic number.

71720767011 is a deficient number, since it is larger than the sum of its proper divisors (23906922341).

71720767011 is a wasteful number, since it uses less digits than its factorization.

71720767011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23906922340.

The product of its (nonzero) digits is 28812, while the sum is 39.

The spelling of 71720767011 in words is "seventy-one billion, seven hundred twenty million, seven hundred sixty-seven thousand, eleven".