2011644564 has 24 divisors (see below), whose sum is σ = 4820698848. Its totient is φ = 652425120.

The previous prime is 2011644563. The next prime is 2011644587. The reversal of 2011644564 is 4654461102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011644563) 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 7 ways as a sum of consecutive naturals, for example, 2264922 + ... + 2265809.

It is an arithmetic number, because the mean of its divisors is an integer number (200862452).

Almost surely, 2^2011644564 is an apocalyptic number.

It is an amenable number.

2011644564 is an abundant number, since it is smaller than the sum of its proper divisors (2809054284).

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

2011644564 is a wasteful number, since it uses less digits than its factorization.

2011644564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4530775 (or 4530773 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 2011644564 is about 44851.3607820320. The cubic root of 2011644564 is about 1262.3615248442.

The spelling of 2011644564 in words is "two billion, eleven million, six hundred forty-four thousand, five hundred sixty-four".