71968216257 has 28 divisors (see below), whose sum is σ = 123317681280. Its totient is φ = 41124692088.

The previous prime is 71968216249. The next prime is 71968216289. The reversal of 71968216257 is 75261286917.

71968216257 is a `hidden beast` number, since 7 + 1 + 9 + 6 + 8 + 2 + 1 + 625 + 7 = 666.

It is not a de Polignac number, because 71968216257 - 2³ = 71968216249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71968216457) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7046457 + ... + 7056662.

Almost surely, 2^71968216257 is an apocalyptic number.

It is an amenable number.

71968216257 is a deficient number, since it is larger than the sum of its proper divisors (51349465023).

71968216257 is an equidigital number, since it uses as much as digits as its factorization.

71968216257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14103144 (or 14103129 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 71968216257 in words is "seventy-one billion, nine hundred sixty-eight million, two hundred sixteen thousand, two hundred fifty-seven".