505561280385 has 32 divisors (see below), whose sum is σ = 924486412032. Its totient is φ = 231105853440.

The previous prime is 505561280377. The next prime is 505561280401. The reversal of 505561280385 is 583082165505.

It is not a de Polignac number, because 505561280385 - 2³ = 505561280377 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3956617 + ... + 4082393.

It is an arithmetic number, because the mean of its divisors is an integer number (28890200376).

Almost surely, 2^505561280385 is an apocalyptic number.

It is an amenable number.

505561280385 is a deficient number, since it is larger than the sum of its proper divisors (418925131647).

505561280385 is a wasteful number, since it uses less digits than its factorization.

505561280385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164073.

The product of its (nonzero) digits is 1440000, while the sum is 48.

The spelling of 505561280385 in words is "five hundred five billion, five hundred sixty-one million, two hundred eighty thousand, three hundred eighty-five".