2106555685 has 16 divisors (see below), whose sum is σ = 2752913520. Its totient is φ = 1538127360.

The previous prime is 2106555683. The next prime is 2106555709. The reversal of 2106555685 is 5865556012.

It can be written as a sum of positive squares in 8 ways, for example, as 214827649 + 1891728036 = 14657^2 + 43494^2 .

It is not a de Polignac number, because 2106555685 - 2¹ = 2106555683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106555683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176286 + ... + 187855.

It is an arithmetic number, because the mean of its divisors is an integer number (172057095).

Almost surely, 2^2106555685 is an apocalyptic number.

It is an amenable number.

2106555685 is a deficient number, since it is larger than the sum of its proper divisors (646357835).

2106555685 is a wasteful number, since it uses less digits than its factorization.

2106555685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364248.

The product of its (nonzero) digits is 360000, while the sum is 43.

The square root of 2106555685 is about 45897.2296004890. The cubic root of 2106555685 is about 1281.9103321233.

The spelling of 2106555685 in words is "two billion, one hundred six million, five hundred fifty-five thousand, six hundred eighty-five".