865769817040 has 20 divisors (see below), whose sum is σ = 2012914824804. Its totient is φ = 346307926784.

The previous prime is 865769817023. The next prime is 865769817091. The reversal of 865769817040 is 40718967568.

It can be written as a sum of positive squares in 2 ways, for example, as 608818151824 + 256951665216 = 780268^2 + 506904^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 865769817040.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5411061277 + ... + 5411061436.

Almost surely, 2^865769817040 is an apocalyptic number.

865769817040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865769817040 is an abundant number, since it is smaller than the sum of its proper divisors (1147145007764).

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

865769817040 is a wasteful number, since it uses less digits than its factorization.

865769817040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10822122726 (or 10822122720 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 865769817040 in words is "eight hundred sixty-five billion, seven hundred sixty-nine million, eight hundred seventeen thousand, forty".