2011081806 has 12 divisors (see below), whose sum is σ = 4357343952. Its totient is φ = 670360596.

The previous prime is 2011081781. The next prime is 2011081819. The reversal of 2011081806 is 6081801102.

It is a self number, because there is not a number n which added to its sum of digits gives 2011081806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55863366 + ... + 55863401.

It is an arithmetic number, because the mean of its divisors is an integer number (363111996).

Almost surely, 2^2011081806 is an apocalyptic number.

2011081806 is an abundant number, since it is smaller than the sum of its proper divisors (2346262146).

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

2011081806 is a wasteful number, since it uses less digits than its factorization.

2011081806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111726775 (or 111726772 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 2011081806 is about 44845.0867542923. The cubic root of 2011081806 is about 1262.2437985627.

Adding to 2011081806 its reverse (6081801102), we get a palindrome (8092882908).

The spelling of 2011081806 in words is "two billion, eleven million, eighty-one thousand, eight hundred six".