2011611653 has 4 divisors (see below), whose sum is σ = 2011749228. Its totient is φ = 2011474080.

The previous prime is 2011611631. The next prime is 2011611673. The reversal of 2011611653 is 3561161102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3561161102 = 2 ⋅1780580551.

It can be written as a sum of positive squares in 2 ways, for example, as 1190388004 + 821223649 = 34502^2 + 28657^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011611653 - 2²⁰ = 2010563077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011611673) 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, 43838 + ... + 77103.

It is an arithmetic number, because the mean of its divisors is an integer number (502937307).

Almost surely, 2^2011611653 is an apocalyptic number.

It is an amenable number.

2011611653 is a deficient number, since it is larger than the sum of its proper divisors (137575).

2011611653 is a wasteful number, since it uses less digits than its factorization.

2011611653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137574.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 2011611653 is about 44850.9938908827. The cubic root of 2011611653 is about 1262.3546406249.

Adding to 2011611653 its reverse (3561161102), we get a palindrome (5572772755).

The spelling of 2011611653 in words is "two billion, eleven million, six hundred eleven thousand, six hundred fifty-three".