71856386686 has 8 divisors (see below), whose sum is σ = 123182377200. Its totient is φ = 30795594288.

The previous prime is 71856386671. The next prime is 71856386699. The reversal of 71856386686 is 68668365817.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2566299511 + ... + 2566299538.

It is an arithmetic number, because the mean of its divisors is an integer number (15397797150).

Almost surely, 2^71856386686 is an apocalyptic number.

71856386686 is a deficient number, since it is larger than the sum of its proper divisors (51325990514).

71856386686 is a wasteful number, since it uses less digits than its factorization.

71856386686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132599058.

The product of its digits is 69672960, while the sum is 64.

The spelling of 71856386686 in words is "seventy-one billion, eight hundred fifty-six million, three hundred eighty-six thousand, six hundred eighty-six".