8158621716 has 216 divisors, whose sum is σ = 24571441440. Its totient is φ = 2275185024.

The previous prime is 8158621687. The next prime is 8158621741. The reversal of 8158621716 is 6171268518.

8158621716 is a `hidden beast` number, since 8 + 1 + 5 + 8 + 621 + 7 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28828911 + ... + 28829193.

Almost surely, 2^8158621716 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 8158621716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12285720720).

8158621716 is an abundant number, since it is smaller than the sum of its proper divisors (16412819724).

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

8158621716 is a wasteful number, since it uses less digits than its factorization.

8158621716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 631 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 8158621716 is about 90325.0890727488. The cubic root of 8158621716 is about 2013.1320620862.

The spelling of 8158621716 in words is "eight billion, one hundred fifty-eight million, six hundred twenty-one thousand, seven hundred sixteen".