4855993661 has 2 divisors, whose sum is σ = 4855993662. Its totient is φ = 4855993660.

The previous prime is 4855993631. The next prime is 4855993663. The reversal of 4855993661 is 1663995584.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4357320100 + 498673561 = 66010^2 + 22331^2 .

It is a cyclic number.

It is not a de Polignac number, because 4855993661 - 2¹⁰ = 4855992637 is a prime.

It is a Sophie Germain prime.

Together with 4855993663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4855993597 and 4855993606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4855993663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2427996830 + 2427996831.

It is an arithmetic number, because the mean of its divisors is an integer number (2427996831).

Almost surely, 2^4855993661 is an apocalyptic number.

It is an amenable number.

4855993661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4855993661 is an equidigital number, since it uses as much as digits as its factorization.

4855993661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 56.

The square root of 4855993661 is about 69684.9600774801. The cubic root of 4855993661 is about 1693.3992784327.

The spelling of 4855993661 in words is "four billion, eight hundred fifty-five million, nine hundred ninety-three thousand, six hundred sixty-one".