2011830661 has 4 divisors (see below), whose sum is σ = 2017530252. Its totient is φ = 2006131072.

The previous prime is 2011830647. The next prime is 2011830683. The reversal of 2011830661 is 1660381102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1594404900 + 417425761 = 39930^2 + 20431^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011830661 - 2⁷ = 2011830533 is a prime.

It is a super-3 number, since 3×2011830661³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011830361) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2849266 + ... + 2849971.

It is an arithmetic number, because the mean of its divisors is an integer number (504382563).

Almost surely, 2^2011830661 is an apocalyptic number.

It is an amenable number.

2011830661 is a deficient number, since it is larger than the sum of its proper divisors (5699591).

2011830661 is an equidigital number, since it uses as much as digits as its factorization.

2011830661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5699590.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2011830661 is about 44853.4353310870. The cubic root of 2011830661 is about 1262.4004506155.

The spelling of 2011830661 in words is "two billion, eleven million, eight hundred thirty thousand, six hundred sixty-one".