2139203665 has 8 divisors (see below), whose sum is σ = 2678655168. Its totient is φ = 1636955760.

The previous prime is 2139203663. The next prime is 2139203699. The reversal of 2139203665 is 5663029312.

2139203665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2139203665 - 2¹ = 2139203663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139203663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9300771 + ... + 9301000.

It is an arithmetic number, because the mean of its divisors is an integer number (334831896).

Almost surely, 2^2139203665 is an apocalyptic number.

It is an amenable number.

2139203665 is a deficient number, since it is larger than the sum of its proper divisors (539451503).

2139203665 is a wasteful number, since it uses less digits than its factorization.

2139203665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18601799.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 2139203665 is about 46251.5260829305. The cubic root of 2139203665 is about 1288.4988778418.

The spelling of 2139203665 in words is "two billion, one hundred thirty-nine million, two hundred three thousand, six hundred sixty-five".