2016569561 has 4 divisors (see below), whose sum is σ = 2081620224. Its totient is φ = 1951518900.

The previous prime is 2016569539. The next prime is 2016569573. The reversal of 2016569561 is 1659656102.

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 2016569561 - 2¹⁰ = 2016568537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2016569501) 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, 32525285 + ... + 32525346.

It is an arithmetic number, because the mean of its divisors is an integer number (520405056).

Almost surely, 2^2016569561 is an apocalyptic number.

It is an amenable number.

2016569561 is a deficient number, since it is larger than the sum of its proper divisors (65050663).

2016569561 is an equidigital number, since it uses as much as digits as its factorization.

2016569561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65050662.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 2016569561 is about 44906.2307592165. The cubic root of 2016569561 is about 1263.3908749991.

The spelling of 2016569561 in words is "two billion, sixteen million, five hundred sixty-nine thousand, five hundred sixty-one".