5555778017 has 2 divisors, whose sum is σ = 5555778018. Its totient is φ = 5555778016.

The previous prime is 5555777999. The next prime is 5555778029. The reversal of 5555778017 is 7108775555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3070157281 + 2485620736 = 55409^2 + 49856^2 .

It is a cyclic number.

It is not a de Polignac number, because 5555778017 - 2²⁸ = 5287342561 is a prime.

It is not a weakly prime, because it can be changed into another prime (5555778817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777889008 + 2777889009.

It is an arithmetic number, because the mean of its divisors is an integer number (2777889009).

Almost surely, 2^5555778017 is an apocalyptic number.

It is an amenable number.

5555778017 is a deficient number, since it is larger than the sum of its proper divisors (1).

5555778017 is an equidigital number, since it uses as much as digits as its factorization.

5555778017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1715000, while the sum is 50.

The square root of 5555778017 is about 74537.0915517905. The cubic root of 5555778017 is about 1771.1212550448.

The spelling of 5555778017 in words is "five billion, five hundred fifty-five million, seven hundred seventy-eight thousand, seventeen".