865655537 has 2 divisors, whose sum is σ = 865655538. Its totient is φ = 865655536.

The previous prime is 865655491. The next prime is 865655587. The reversal of 865655537 is 735556568.

It is an a-pointer prime, because the next prime (865655587) can be obtained adding 865655537 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487703056 + 377952481 = 22084^2 + 19441^2 .

It is a cyclic number.

It is not a de Polignac number, because 865655537 - 2¹⁸ = 865393393 is a prime.

It is not a weakly prime, because it can be changed into another prime (865655587) 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, 432827768 + 432827769.

It is an arithmetic number, because the mean of its divisors is an integer number (432827769).

Almost surely, 2^865655537 is an apocalyptic number.

It is an amenable number.

865655537 is a deficient number, since it is larger than the sum of its proper divisors (1).

865655537 is an equidigital number, since it uses as much as digits as its factorization.

865655537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780000, while the sum is 50.

The square root of 865655537 is about 29422.0246923967. The cubic root of 865655537 is about 953.0485766505.

The spelling of 865655537 in words is "eight hundred sixty-five million, six hundred fifty-five thousand, five hundred thirty-seven".