2173858865 has 8 divisors (see below), whose sum is σ = 2657850408. Its totient is φ = 1706273920.

The previous prime is 2173858847. The next prime is 2173858889. The reversal of 2173858865 is 5688583712.

It can be written as a sum of positive squares in 4 ways, for example, as 899940001 + 1273918864 = 29999^2 + 35692^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2173858865 - 2¹⁶ = 2173793329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4101356 + ... + 4101885.

It is an arithmetic number, because the mean of its divisors is an integer number (332231301).

Almost surely, 2^2173858865 is an apocalyptic number.

It is an amenable number.

2173858865 is a deficient number, since it is larger than the sum of its proper divisors (483991543).

2173858865 is an equidigital number, since it uses as much as digits as its factorization.

2173858865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8203299.

The product of its digits is 3225600, while the sum is 53.

The square root of 2173858865 is about 46624.6594089437. The cubic root of 2173858865 is about 1295.4195536874.

The spelling of 2173858865 in words is "two billion, one hundred seventy-three million, eight hundred fifty-eight thousand, eight hundred sixty-five".