2011644443 has 4 divisors (see below), whose sum is σ = 2011981440. Its totient is φ = 2011307448.

The previous prime is 2011644433. The next prime is 2011644449. The reversal of 2011644443 is 3444461102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3444461102 = 2 ⋅1722230551.

It is a cyclic number.

It is not a de Polignac number, because 2011644443 - 2¹² = 2011640347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011644449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159380 + ... + 171537.

It is an arithmetic number, because the mean of its divisors is an integer number (502995360).

Almost surely, 2^2011644443 is an apocalyptic number.

2011644443 is a deficient number, since it is larger than the sum of its proper divisors (336997).

2011644443 is an equidigital number, since it uses as much as digits as its factorization.

2011644443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336996.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 2011644443 is about 44851.3594331320. The cubic root of 2011644443 is about 1262.3614995339.

The spelling of 2011644443 in words is "two billion, eleven million, six hundred forty-four thousand, four hundred forty-three".