5616000661 has 2 divisors, whose sum is σ = 5616000662. Its totient is φ = 5616000660.

The previous prime is 5616000647. The next prime is 5616000679. The reversal of 5616000661 is 1660006165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5208364561 + 407636100 = 72169^2 + 20190^2 .

It is a cyclic number.

It is not a de Polignac number, because 5616000661 - 2⁹ = 5616000149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5616000161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2808000330 + 2808000331.

It is an arithmetic number, because the mean of its divisors is an integer number (2808000331).

Almost surely, 2^5616000661 is an apocalyptic number.

It is an amenable number.

5616000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5616000661 is an equidigital number, since it uses as much as digits as its factorization.

5616000661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 5616000661 is about 74939.9803909769. The cubic root of 5616000661 is about 1777.4977107812.

The spelling of 5616000661 in words is "five billion, six hundred sixteen million, six hundred sixty-one", and thus it is an aban number.