2081615865 has 16 divisors (see below), whose sum is σ = 3806383488. Its totient is φ = 951595776.

The previous prime is 2081615857. The next prime is 2081615867. The reversal of 2081615865 is 5685161802.

It is not a de Polignac number, because 2081615865 - 2³ = 2081615857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2081615867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9912352 + ... + 9912561.

It is an arithmetic number, because the mean of its divisors is an integer number (237898968).

Almost surely, 2^2081615865 is an apocalyptic number.

It is an amenable number.

2081615865 is a deficient number, since it is larger than the sum of its proper divisors (1724767623).

2081615865 is a wasteful number, since it uses less digits than its factorization.

2081615865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19824928.

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 2081615865 is about 45624.7286567274. The cubic root of 2081615865 is about 1276.8313275865.

The spelling of 2081615865 in words is "two billion, eighty-one million, six hundred fifteen thousand, eight hundred sixty-five".