2016516561 has 4 divisors (see below), whose sum is σ = 2688688752. Its totient is φ = 1344344372.

The previous prime is 2016516533. The next prime is 2016516577. The reversal of 2016516561 is 1656156102.

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 2016516561 - 2⁶ = 2016516497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2016516581) 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, 336086091 + ... + 336086096.

It is an arithmetic number, because the mean of its divisors is an integer number (672172188).

Almost surely, 2^2016516561 is an apocalyptic number.

It is an amenable number.

2016516561 is a deficient number, since it is larger than the sum of its proper divisors (672172191).

2016516561 is an equidigital number, since it uses as much as digits as its factorization.

2016516561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672172190.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 2016516561 is about 44905.6406367841. The cubic root of 2016516561 is about 1263.3798066475.

The spelling of 2016516561 in words is "two billion, sixteen million, five hundred sixteen thousand, five hundred sixty-one".