505505050591 has 4 divisors (see below), whose sum is σ = 505584526384. Its totient is φ = 505425574800.

The previous prime is 505505050549. The next prime is 505505050657. The reversal of 505505050591 is 195050505505.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 505505050591 - 2³³ = 496915115999 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 (505505050541) 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, 39728355 + ... + 39741076.

It is an arithmetic number, because the mean of its divisors is an integer number (126396131596).

Almost surely, 2^505505050591 is an apocalyptic number.

505505050591 is a deficient number, since it is larger than the sum of its proper divisors (79475793).

505505050591 is an equidigital number, since it uses as much as digits as its factorization.

505505050591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79475792.

The product of its (nonzero) digits is 140625, while the sum is 40.

The spelling of 505505050591 in words is "five hundred five billion, five hundred five million, fifty thousand, five hundred ninety-one".