2105561685 has 8 divisors (see below), whose sum is σ = 3368898720. Its totient is φ = 1122966224.

The previous prime is 2105561681. The next prime is 2105561713. The reversal of 2105561685 is 5861655012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2105561685 - 2² = 2105561681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105561681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70185375 + ... + 70185404.

It is an arithmetic number, because the mean of its divisors is an integer number (421112340).

Almost surely, 2^2105561685 is an apocalyptic number.

It is an amenable number.

2105561685 is a deficient number, since it is larger than the sum of its proper divisors (1263337035).

2105561685 is a wasteful number, since it uses less digits than its factorization.

2105561685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140370787.

The product of its (nonzero) digits is 72000, while the sum is 39.

The square root of 2105561685 is about 45886.3997825064. The cubic root of 2105561685 is about 1281.7086728698.

The spelling of 2105561685 in words is "two billion, one hundred five million, five hundred sixty-one thousand, six hundred eighty-five".