2011565617 has 4 divisors (see below), whose sum is σ = 2018118256. Its totient is φ = 2005012980.

The previous prime is 2011565581. The next prime is 2011565639. The reversal of 2011565617 is 7165651102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011565617 - 2⁷ = 2011565489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011565687) 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, 3275859 + ... + 3276472.

It is an arithmetic number, because the mean of its divisors is an integer number (504529564).

Almost surely, 2^2011565617 is an apocalyptic number.

It is an amenable number.

2011565617 is a deficient number, since it is larger than the sum of its proper divisors (6552639).

2011565617 is an equidigital number, since it uses as much as digits as its factorization.

2011565617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6552638.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 2011565617 is about 44850.4806774688. The cubic root of 2011565617 is about 1262.3450108336.

The spelling of 2011565617 in words is "two billion, eleven million, five hundred sixty-five thousand, six hundred seventeen".