2138708205617 has 4 divisors (see below), whose sum is σ = 2138716305216. Its totient is φ = 2138700106020.

The previous prime is 2138708205607. The next prime is 2138708205637. The reversal of 2138708205617 is 7165028078312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2138708205617 - 2¹⁶ = 2138708140081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138708205607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3639893 + ... + 4186434.

It is an arithmetic number, because the mean of its divisors is an integer number (534679076304).

Almost surely, 2^{2138708205617} is an apocalyptic number.

It is an amenable number.

2138708205617 is a deficient number, since it is larger than the sum of its proper divisors (8099599).

2138708205617 is an equidigital number, since it uses as much as digits as its factorization.

2138708205617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8099598.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 2138708205617 in words is "two trillion, one hundred thirty-eight billion, seven hundred eight million, two hundred five thousand, six hundred seventeen".