5516620661 has 2 divisors, whose sum is σ = 5516620662. Its totient is φ = 5516620660.

The previous prime is 5516620657. The next prime is 5516620663. The reversal of 5516620661 is 1660266155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5339224900 + 177395761 = 73070^2 + 13319^2 .

It is a cyclic number.

It is not a de Polignac number, because 5516620661 - 2² = 5516620657 is a prime.

Together with 5516620663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5516620663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2758310330 + 2758310331.

It is an arithmetic number, because the mean of its divisors is an integer number (2758310331).

Almost surely, 2^5516620661 is an apocalyptic number.

It is an amenable number.

5516620661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5516620661 is an equidigital number, since it uses as much as digits as its factorization.

5516620661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 5516620661 is about 74273.9568152929. The cubic root of 5516620661 is about 1766.9504620906.

The spelling of 5516620661 in words is "five billion, five hundred sixteen million, six hundred twenty thousand, six hundred sixty-one".