865320716511 has 12 divisors (see below), whose sum is σ = 1249922730888. Its totient is φ = 576873541104.

The previous prime is 865320716509. The next prime is 865320716539. The reversal of 865320716511 is 115617023568.

865320716511 is a `hidden beast` number, since 8 + 65 + 3 + 2 + 0 + 71 + 6 + 511 = 666.

865320716511 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 865320716511 - 2¹ = 865320716509 is a prime.

It is a super-2 number, since 2×865320716511² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865320716551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278881 + ... + 1344773.

It is an arithmetic number, because the mean of its divisors is an integer number (104160227574).

Almost surely, 2^865320716511 is an apocalyptic number.

865320716511 is a deficient number, since it is larger than the sum of its proper divisors (384602014377).

865320716511 is a wasteful number, since it uses less digits than its factorization.

865320716511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156102 (or 1156099 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 865320716511 in words is "eight hundred sixty-five billion, three hundred twenty million, seven hundred sixteen thousand, five hundred eleven".