8120658891 has 16 divisors (see below), whose sum is σ = 11096426880. Its totient is φ = 5279446080.

The previous prime is 8120658883. The next prime is 8120658893. The reversal of 8120658891 is 1988560218.

It is not a de Polignac number, because 8120658891 - 2³ = 8120658883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8120658891.

It is not an unprimeable number, because it can be changed into a prime (8120658893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299296 + ... + 325298.

It is an arithmetic number, because the mean of its divisors is an integer number (693526680).

Almost surely, 2^8120658891 is an apocalyptic number.

8120658891 is a deficient number, since it is larger than the sum of its proper divisors (2975767989).

8120658891 is a wasteful number, since it uses less digits than its factorization.

8120658891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28586.

The product of its (nonzero) digits is 276480, while the sum is 48.

The square root of 8120658891 is about 90114.6985291523. The cubic root of 8120658891 is about 2010.0047763556.

The spelling of 8120658891 in words is "eight billion, one hundred twenty million, six hundred fifty-eight thousand, eight hundred ninety-one".