2166108478 has 4 divisors (see below), whose sum is σ = 3249162720. Its totient is φ = 1083054238.

The previous prime is 2166108473. The next prime is 2166108479. The reversal of 2166108478 is 8748016612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166108473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541527118 + ... + 541527121.

It is an arithmetic number, because the mean of its divisors is an integer number (812290680).

Almost surely, 2^2166108478 is an apocalyptic number.

2166108478 is a deficient number, since it is larger than the sum of its proper divisors (1083054242).

2166108478 is a wasteful number, since it uses less digits than its factorization.

2166108478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083054241.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 2166108478 is about 46541.4705182378. The cubic root of 2166108478 is about 1293.8782149981.

The spelling of 2166108478 in words is "two billion, one hundred sixty-six million, one hundred eight thousand, four hundred seventy-eight".