865945549571 has 2 divisors, whose sum is σ = 865945549572. Its totient is φ = 865945549570.

The previous prime is 865945549549. The next prime is 865945549577. The reversal of 865945549571 is 175945549568.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865945549571 is a prime.

It is not a weakly prime, because it can be changed into another prime (865945549577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432972774785 + 432972774786.

It is an arithmetic number, because the mean of its divisors is an integer number (432972774786).

Almost surely, 2^865945549571 is an apocalyptic number.

865945549571 is a deficient number, since it is larger than the sum of its proper divisors (1).

865945549571 is an equidigital number, since it uses as much as digits as its factorization.

865945549571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160000, while the sum is 68.

The spelling of 865945549571 in words is "eight hundred sixty-five billion, nine hundred forty-five million, five hundred forty-nine thousand, five hundred seventy-one".