865115565187 has 2 divisors, whose sum is σ = 865115565188. Its totient is φ = 865115565186.

The previous prime is 865115565131. The next prime is 865115565203. The reversal of 865115565187 is 781565511568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865115565187 - 2¹⁹ = 865115040899 is a prime.

It is a super-2 number, since 2×865115565187² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (865115565107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432557782593 + 432557782594.

It is an arithmetic number, because the mean of its divisors is an integer number (432557782594).

Almost surely, 2^865115565187 is an apocalyptic number.

865115565187 is a deficient number, since it is larger than the sum of its proper divisors (1).

865115565187 is an equidigital number, since it uses as much as digits as its factorization.

865115565187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080000, while the sum is 58.

The spelling of 865115565187 in words is "eight hundred sixty-five billion, one hundred fifteen million, five hundred sixty-five thousand, one hundred eighty-seven".