865945549568 has 72 divisors (see below), whose sum is σ = 1996566077520. Its totient is φ = 370457968640.

The previous prime is 865945549549. The next prime is 865945549571.

865945549568 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 865945549495 and 865945549504.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 8996513 + ... + 9092256.

It is an arithmetic number, because the mean of its divisors is an integer number (27730084410).

Almost surely, 2^865945549568 is an apocalyptic number.

865945549568 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

865945549568 is an abundant number, since it is smaller than the sum of its proper divisors (1130620527952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865945549568 is a wasteful number, since it uses less digits than its factorization.

865945549568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18088813 (or 18088799 counting only the distinct ones).

The product of its digits is 1866240000, while the sum is 74.

The spelling of 865945549568 in words is "eight hundred sixty-five billion, nine hundred forty-five million, five hundred forty-nine thousand, five hundred sixty-eight".