8171565887 has 2 divisors, whose sum is σ = 8171565888. Its totient is φ = 8171565886.

The previous prime is 8171565877. The next prime is 8171565889. The reversal of 8171565887 is 7885651718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8171565887 - 2⁸ = 8171565631 is a prime.

Together with 8171565889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8171565889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4085782943 + 4085782944.

It is an arithmetic number, because the mean of its divisors is an integer number (4085782944).

Almost surely, 2^8171565887 is an apocalyptic number.

8171565887 is a deficient number, since it is larger than the sum of its proper divisors (1).

8171565887 is an equidigital number, since it uses as much as digits as its factorization.

8171565887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3763200, while the sum is 56.

The square root of 8171565887 is about 90396.7139170446. The cubic root of 8171565887 is about 2014.1961534501.

The spelling of 8171565887 in words is "eight billion, one hundred seventy-one million, five hundred sixty-five thousand, eight hundred eighty-seven".