505555091789 has 4 divisors (see below), whose sum is σ = 551514645600. Its totient is φ = 459595537980.

The previous prime is 505555091759. The next prime is 505555091803. The reversal of 505555091789 is 987190555505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505555091789 - 2¹² = 505555087693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505555091759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22979776889 + ... + 22979776910.

It is an arithmetic number, because the mean of its divisors is an integer number (137878661400).

Almost surely, 2^505555091789 is an apocalyptic number.

It is an amenable number.

505555091789 is a deficient number, since it is larger than the sum of its proper divisors (45959553811).

505555091789 is a wasteful number, since it uses less digits than its factorization.

505555091789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45959553810.

The product of its (nonzero) digits is 14175000, while the sum is 59.

The spelling of 505555091789 in words is "five hundred five billion, five hundred fifty-five million, ninety-one thousand, seven hundred eighty-nine".