71691937856 has 56 divisors (see below), whose sum is σ = 177367728576. Its totient is φ = 27931921920.

The previous prime is 71691937789. The next prime is 71691937897. The reversal of 71691937856 is 65873919617.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7269011 + ... + 7278866.

Almost surely, 2^71691937856 is an apocalyptic number.

It is an amenable number.

71691937856 is an abundant number, since it is smaller than the sum of its proper divisors (105675790720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71691937856 is a wasteful number, since it uses less digits than its factorization.

71691937856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14547907 (or 14547897 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 62.

The spelling of 71691937856 in words is "seventy-one billion, six hundred ninety-one million, nine hundred thirty-seven thousand, eight hundred fifty-six".