50505499991 has 4 divisors (see below), whose sum is σ = 50575744800. Its totient is φ = 50435255184.

The previous prime is 50505499921. The next prime is 50505500021. The reversal of 50505499991 is 19999450505.

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 50505499991 - 2²⁶ = 50438391127 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 (50505499921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35121326 + ... + 35122763.

It is an arithmetic number, because the mean of its divisors is an integer number (12643936200).

Almost surely, 2^50505499991 is an apocalyptic number.

50505499991 is a deficient number, since it is larger than the sum of its proper divisors (70244809).

50505499991 is an equidigital number, since it uses as much as digits as its factorization.

50505499991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70244808.

The product of its (nonzero) digits is 3280500, while the sum is 56.

The spelling of 50505499991 in words is "fifty billion, five hundred five million, four hundred ninety-nine thousand, nine hundred ninety-one".