8121868686 has 12 divisors (see below), whose sum is σ = 17597382192. Its totient is φ = 2707289556.

The previous prime is 8121868663. The next prime is 8121868691. The reversal of 8121868686 is 6868681218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 225607446 + ... + 225607481.

It is an arithmetic number, because the mean of its divisors is an integer number (1466448516).

Almost surely, 2^8121868686 is an apocalyptic number.

8121868686 is an abundant number, since it is smaller than the sum of its proper divisors (9475513506).

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

8121868686 is a wasteful number, since it uses less digits than its factorization.

8121868686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451214935 (or 451214932 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 54.

The square root of 8121868686 is about 90121.4108078652. The cubic root of 8121868686 is about 2010.1045865235.

The spelling of 8121868686 in words is "eight billion, one hundred twenty-one million, eight hundred sixty-eight thousand, six hundred eighty-six".