561516616 has 8 divisors (see below), whose sum is σ = 1052843670. Its totient is φ = 280758304.

The previous prime is 561516611. The next prime is 561516617. The reversal of 561516616 is 616615165.

It can be written as a sum of positive squares in only one way, i.e., 343954116 + 217562500 = 18546^2 + 14750^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (561516611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35094781 + ... + 35094796.

Almost surely, 2^561516616 is an apocalyptic number.

It is an amenable number.

561516616 is a deficient number, since it is larger than the sum of its proper divisors (491327054).

561516616 is a wasteful number, since it uses less digits than its factorization.

561516616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70189583 (or 70189579 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 561516616 is about 23696.3418273792. The cubic root of 561516616 is about 825.0004853379. Note that the first 3 decimals are identical.

The spelling of 561516616 in words is "five hundred sixty-one million, five hundred sixteen thousand, six hundred sixteen".