8105561187 has 16 divisors (see below), whose sum is σ = 10995972480. Its totient is φ = 5309518592.

The previous prime is 8105561159. The next prime is 8105561213. The reversal of 8105561187 is 7811655018.

It is a cyclic number.

It is not a de Polignac number, because 8105561187 - 2¹⁰ = 8105560163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8105561117) 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, 392248 + ... + 412394.

It is an arithmetic number, because the mean of its divisors is an integer number (687248280).

Almost surely, 2^8105561187 is an apocalyptic number.

8105561187 is a deficient number, since it is larger than the sum of its proper divisors (2890411293).

8105561187 is a wasteful number, since it uses less digits than its factorization.

8105561187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22482.

The product of its (nonzero) digits is 67200, while the sum is 42.

The square root of 8105561187 is about 90030.8901822036. The cubic root of 8105561187 is about 2008.7583552035.

The spelling of 8105561187 in words is "eight billion, one hundred five million, five hundred sixty-one thousand, one hundred eighty-seven".