71686644398 has 8 divisors (see below), whose sum is σ = 112205182608. Its totient is φ = 34284916864.

The previous prime is 71686644397. The next prime is 71686644451. The reversal of 71686644398 is 89344668617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 71686644398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71686644397) 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, 779202611 + ... + 779202702.

It is an arithmetic number, because the mean of its divisors is an integer number (14025647826).

Almost surely, 2^71686644398 is an apocalyptic number.

71686644398 is a deficient number, since it is larger than the sum of its proper divisors (40518538210).

71686644398 is a wasteful number, since it uses less digits than its factorization.

71686644398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558405338.

The product of its digits is 41803776, while the sum is 62.

It can be divided in two parts, 7168 and 6644398, that added together give a palindrome (6651566).

The spelling of 71686644398 in words is "seventy-one billion, six hundred eighty-six million, six hundred forty-four thousand, three hundred ninety-eight".