8118129561 has 8 divisors (see below), whose sum is σ = 11460888864. Its totient is φ = 5093728320.

The previous prime is 8118129553. The next prime is 8118129589. The reversal of 8118129561 is 1659218118.

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

It is not a de Polignac number, because 8118129561 - 2³ = 8118129553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8118129521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79589455 + ... + 79589556.

It is an arithmetic number, because the mean of its divisors is an integer number (1432611108).

Almost surely, 2^8118129561 is an apocalyptic number.

It is an amenable number.

8118129561 is a deficient number, since it is larger than the sum of its proper divisors (3342759303).

8118129561 is a wasteful number, since it uses less digits than its factorization.

8118129561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159179031.

The product of its digits is 34560, while the sum is 42.

The square root of 8118129561 is about 90100.6634881231. The cubic root of 8118129561 is about 2009.7960702488.

The spelling of 8118129561 in words is "eight billion, one hundred eighteen million, one hundred twenty-nine thousand, five hundred sixty-one".