2105661798 has 32 divisors (see below), whose sum is σ = 4691082720. Its totient is φ = 700112160.

The previous prime is 2105661781. The next prime is 2105661821. The reversal of 2105661798 is 8971665012.

2105661798 is a `hidden beast` number, since 2 + 10 + 566 + 1 + 79 + 8 = 666.

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 in 15 ways as a sum of consecutive naturals, for example, 27673 + ... + 70548.

It is an arithmetic number, because the mean of its divisors is an integer number (146596335).

Almost surely, 2^2105661798 is an apocalyptic number.

2105661798 is an abundant number, since it is smaller than the sum of its proper divisors (2585420922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2105661798 is a wasteful number, since it uses less digits than its factorization.

2105661798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98629 (or 98623 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 2105661798 is about 45887.4906483238. The cubic root of 2105661798 is about 1281.7289863199.

The spelling of 2105661798 in words is "two billion, one hundred five million, six hundred sixty-one thousand, seven hundred ninety-eight".