505563213509 has 16 divisors (see below), whose sum is σ = 529743680640. Its totient is φ = 481567088640.

The previous prime is 505563213497. The next prime is 505563213517. The reversal of 505563213509 is 905312365505.

It is a cyclic number.

It is not a de Polignac number, because 505563213509 - 2¹² = 505563209413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505563213509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505563213409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26241122 + ... + 26260380.

It is an arithmetic number, because the mean of its divisors is an integer number (33108980040).

Almost surely, 2^505563213509 is an apocalyptic number.

It is an amenable number.

505563213509 is a deficient number, since it is larger than the sum of its proper divisors (24180467131).

505563213509 is a wasteful number, since it uses less digits than its factorization.

505563213509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23980.

The product of its (nonzero) digits is 607500, while the sum is 44.

The spelling of 505563213509 in words is "five hundred five billion, five hundred sixty-three million, two hundred thirteen thousand, five hundred nine".