2103809665 has 8 divisors (see below), whose sum is σ = 2525439168. Its totient is φ = 1682469360.

The previous prime is 2103809657. The next prime is 2103809681. The reversal of 2103809665 is 5669083012.

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

It is not a de Polignac number, because 2103809665 - 2³ = 2103809657 is a prime.

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, 55957 + ... + 85666.

It is an arithmetic number, because the mean of its divisors is an integer number (315679896).

Almost surely, 2^2103809665 is an apocalyptic number.

It is an amenable number.

2103809665 is a deficient number, since it is larger than the sum of its proper divisors (421629503).

2103809665 is a wasteful number, since it uses less digits than its factorization.

2103809665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144599.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 2103809665 is about 45867.3049677000. The cubic root of 2103809665 is about 1281.3530745868.

The spelling of 2103809665 in words is "two billion, one hundred three million, eight hundred nine thousand, six hundred sixty-five".