2105605654523 has 32 divisors (see below), whose sum is σ = 2529299367936. Its totient is φ = 1715350589568.

The previous prime is 2105605654511. The next prime is 2105605654673. The reversal of 2105605654523 is 3254565065012.

It is not a de Polignac number, because 2105605654523 - 2¹⁶ = 2105605588987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105605654223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2017265 + ... + 2877597.

It is an arithmetic number, because the mean of its divisors is an integer number (79040605248).

Almost surely, 2^{2105605654523} is an apocalyptic number.

2105605654523 is a deficient number, since it is larger than the sum of its proper divisors (423693713413).

2105605654523 is a wasteful number, since it uses less digits than its factorization.

2105605654523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860603.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 2105605654523 in words is "two trillion, one hundred five billion, six hundred five million, six hundred fifty-four thousand, five hundred twenty-three".