865128580767 has 12 divisors (see below), whose sum is σ = 1363232915304. Its totient is φ = 524320351920.

The previous prime is 865128580741. The next prime is 865128580769. The reversal of 865128580767 is 767085821568.

865128580767 is a `hidden beast` number, since 8 + 6 + 512 + 8 + 58 + 0 + 7 + 67 = 666.

It is not a de Polignac number, because 865128580767 - 2⁶ = 865128580703 is a prime.

It is a super-2 number, since 2×865128580767² (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 (865128580769) 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, 4369336168 + ... + 4369336365.

It is an arithmetic number, because the mean of its divisors is an integer number (113602742942).

Almost surely, 2^865128580767 is an apocalyptic number.

865128580767 is a deficient number, since it is larger than the sum of its proper divisors (498104334537).

865128580767 is a wasteful number, since it uses less digits than its factorization.

865128580767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8738672550 (or 8738672547 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 63.

The spelling of 865128580767 in words is "eight hundred sixty-five billion, one hundred twenty-eight million, five hundred eighty thousand, seven hundred sixty-seven".