71663858688 has 88 divisors (see below), whose sum is σ = 191189603488. Its totient is φ = 23865532416.

The previous prime is 71663858671. The next prime is 71663858719. The reversal of 71663858688 is 88685836617.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3439470 + ... + 3460242.

Almost surely, 2^71663858688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71663858688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95594801744).

71663858688 is an abundant number, since it is smaller than the sum of its proper divisors (119525744800).

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

71663858688 is a wasteful number, since it uses less digits than its factorization.

71663858688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21919 (or 21901 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 66.

The spelling of 71663858688 in words is "seventy-one billion, six hundred sixty-three million, eight hundred fifty-eight thousand, six hundred eighty-eight".