2108166638 has 4 divisors (see below), whose sum is σ = 3162249960. Its totient is φ = 1054083318.

The previous prime is 2108166601. The next prime is 2108166647. The reversal of 2108166638 is 8366618012.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 2108166595 and 2108166604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527041658 + ... + 527041661.

It is an arithmetic number, because the mean of its divisors is an integer number (790562490).

Almost surely, 2^2108166638 is an apocalyptic number.

2108166638 is a deficient number, since it is larger than the sum of its proper divisors (1054083322).

2108166638 is a wasteful number, since it uses less digits than its factorization.

2108166638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054083321.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 2108166638 is about 45914.7758134568. The cubic root of 2108166638 is about 1282.2370219765.

The spelling of 2108166638 in words is "two billion, one hundred eight million, one hundred sixty-six thousand, six hundred thirty-eight".