853449869017 has 4 divisors (see below), whose sum is σ = 856622545380. Its totient is φ = 850277192656.

The previous prime is 853449868993. The next prime is 853449869087. The reversal of 853449869017 is 710968944358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710968944358 = 2 ⋅355484472179.

It can be written as a sum of positive squares in 2 ways, for example, as 180072073801 + 673377795216 = 424349^2 + 820596^2 .

It is a cyclic number.

It is not a de Polignac number, because 853449869017 - 2²⁷ = 853315651289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 853449869017.

It is not an unprimeable number, because it can be changed into a prime (853449869087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1586337778 + ... + 1586338315.

It is an arithmetic number, because the mean of its divisors is an integer number (214155636345).

Almost surely, 2^853449869017 is an apocalyptic number.

It is an amenable number.

853449869017 is a deficient number, since it is larger than the sum of its proper divisors (3172676363).

853449869017 is a wasteful number, since it uses less digits than its factorization.

853449869017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172676362.

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 853449869017 in words is "eight hundred fifty-three billion, four hundred forty-nine million, eight hundred sixty-nine thousand, seventeen".