865255523511 has 12 divisors (see below), whose sum is σ = 1181127612408. Its totient is φ = 563422197744.

The previous prime is 865255523501. The next prime is 865255523567. The reversal of 865255523511 is 115325552568.

It is not a de Polignac number, because 865255523511 - 2⁷ = 865255523383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865255523501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77987560 + ... + 77998653.

It is an arithmetic number, because the mean of its divisors is an integer number (98427301034).

Almost surely, 2^865255523511 is an apocalyptic number.

865255523511 is a deficient number, since it is larger than the sum of its proper divisors (315872088897).

865255523511 is a wasteful number, since it uses less digits than its factorization.

865255523511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155986302 (or 155986259 counting only the distinct ones).

The product of its digits is 1800000, while the sum is 48.

The spelling of 865255523511 in words is "eight hundred sixty-five billion, two hundred fifty-five million, five hundred twenty-three thousand, five hundred eleven".