505549999993 has 2 divisors, whose sum is σ = 505549999994. Its totient is φ = 505549999992.

The previous prime is 505549999991. The next prime is 505550000017. The reversal of 505549999993 is 399999945505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488731022649 + 16818977344 = 699093^2 + 129688^2 .

It is a cyclic number.

It is not a de Polignac number, because 505549999993 - 2¹ = 505549999991 is a prime.

Together with 505549999991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (505549999991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252774999996 + 252774999997.

It is an arithmetic number, because the mean of its divisors is an integer number (252774999997).

Almost surely, 2^505549999993 is an apocalyptic number.

It is an amenable number.

505549999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

505549999993 is an equidigital number, since it uses as much as digits as its factorization.

505549999993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 797161500, while the sum is 76.

The spelling of 505549999993 in words is "five hundred five billion, five hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".