2216016561 has 16 divisors (see below), whose sum is σ = 3225240000. Its totient is φ = 1342230720.

The previous prime is 2216016559. The next prime is 2216016613. The reversal of 2216016561 is 1656106122.

It is not a de Polignac number, because 2216016561 - 2¹ = 2216016559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2216016541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37815 + ... + 76563.

It is an arithmetic number, because the mean of its divisors is an integer number (201577500).

Almost surely, 2^2216016561 is an apocalyptic number.

It is an amenable number.

2216016561 is a deficient number, since it is larger than the sum of its proper divisors (1009223439).

2216016561 is a wasteful number, since it uses less digits than its factorization.

2216016561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40496.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2216016561 is about 47074.5850857976. The cubic root of 2216016561 is about 1303.7400307982.

The spelling of 2216016561 in words is "two billion, two hundred sixteen million, sixteen thousand, five hundred sixty-one".