2106856818 has 120 divisors (see below), whose sum is σ = 5472198864. Its totient is φ = 600739200.

The previous prime is 2106856771. The next prime is 2106856837. The reversal of 2106856818 is 8186586012.

2106856818 is a `hidden beast` number, since 2 + 10 + 68 + 568 + 18 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 512953 + ... + 517043.

Almost surely, 2^2106856818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2106856818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2736099432).

2106856818 is an abundant number, since it is smaller than the sum of its proper divisors (3365342046).

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

2106856818 is a wasteful number, since it uses less digits than its factorization.

2106856818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150 (or 4124 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 2106856818 is about 45900.5099971667. The cubic root of 2106856818 is about 1281.9714124156.

The spelling of 2106856818 in words is "two billion, one hundred six million, eight hundred fifty-six thousand, eight hundred eighteen".