865680143 has 2 divisors, whose sum is σ = 865680144. Its totient is φ = 865680142.

The previous prime is 865680139. The next prime is 865680149. The reversal of 865680143 is 341086568.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 865680143 - 2² = 865680139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 865680143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865680149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432840071 + 432840072.

It is an arithmetic number, because the mean of its divisors is an integer number (432840072).

Almost surely, 2^865680143 is an apocalyptic number.

865680143 is a deficient number, since it is larger than the sum of its proper divisors (1).

865680143 is an equidigital number, since it uses as much as digits as its factorization.

865680143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 865680143 is about 29422.4428455558. The cubic root of 865680143 is about 953.0576066053.

The spelling of 865680143 in words is "eight hundred sixty-five million, six hundred eighty thousand, one hundred forty-three".