2099865601 has 4 divisors (see below), whose sum is σ = 2099957332. Its totient is φ = 2099773872.

The previous prime is 2099865589. The next prime is 2099865613. The reversal of 2099865601 is 1065689902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1065689902 = 2 ⋅532844951.

It is an interprime number because it is at equal distance from previous prime (2099865589) and next prime (2099865613).

It can be written as a sum of positive squares in 2 ways, for example, as 446223376 + 1653642225 = 21124^2 + 40665^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099865601 - 2¹⁷ = 2099734529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2099865641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20035 + ... + 67831.

It is an arithmetic number, because the mean of its divisors is an integer number (524989333).

Almost surely, 2^2099865601 is an apocalyptic number.

It is an amenable number.

2099865601 is a deficient number, since it is larger than the sum of its proper divisors (91731).

2099865601 is an equidigital number, since it uses as much as digits as its factorization.

2099865601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91730.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 2099865601 is about 45824.2905127837. The cubic root of 2099865601 is about 1280.5518455858.

The spelling of 2099865601 in words is "two billion, ninety-nine million, eight hundred sixty-five thousand, six hundred one".