71691959649 has 16 divisors (see below), whose sum is σ = 101572384320. Its totient is φ = 44823098880.

The previous prime is 71691959641. The next prime is 71691959663. The reversal of 71691959649 is 94695919617.

It is not a de Polignac number, because 71691959649 - 2³ = 71691959641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71691959649.

It is not an unprimeable number, because it can be changed into a prime (71691959641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2486959 + ... + 2515620.

It is an arithmetic number, because the mean of its divisors is an integer number (6348274020).

Almost surely, 2^71691959649 is an apocalyptic number.

It is an amenable number.

71691959649 is a deficient number, since it is larger than the sum of its proper divisors (29880424671).

71691959649 is a wasteful number, since it uses less digits than its factorization.

71691959649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002880.

The product of its digits is 33067440, while the sum is 66.

The spelling of 71691959649 in words is "seventy-one billion, six hundred ninety-one million, nine hundred fifty-nine thousand, six hundred forty-nine".