71321681889 has 48 divisors (see below), whose sum is σ = 112391073600. Its totient is φ = 43410826368.

The previous prime is 71321681857. The next prime is 71321681909. The reversal of 71321681889 is 98818612317.

It is not a de Polignac number, because 71321681889 - 2⁵ = 71321681857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71321681819) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2699427 + ... + 2725719.

It is an arithmetic number, because the mean of its divisors is an integer number (2341480700).

Almost surely, 2^71321681889 is an apocalyptic number.

It is an amenable number.

71321681889 is a deficient number, since it is larger than the sum of its proper divisors (41069391711).

71321681889 is a wasteful number, since it uses less digits than its factorization.

71321681889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26894 (or 26891 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 71321681889 in words is "seventy-one billion, three hundred twenty-one million, six hundred eighty-one thousand, eight hundred eighty-nine".