50991218305 has 8 divisors (see below), whose sum is σ = 61261201512. Its totient is φ = 40745148288.

The previous prime is 50991218297. The next prime is 50991218309. The reversal of 50991218305 is 50381219905.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 234733041 + 50756485264 = 15321^2 + 225292^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 50991218305 - 2³ = 50991218297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50991218309) 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 7 ways as a sum of consecutive naturals, for example, 5973604 + ... + 5982133.

It is an arithmetic number, because the mean of its divisors is an integer number (7657650189).

Almost surely, 2^50991218305 is an apocalyptic number.

It is an amenable number.

50991218305 is a deficient number, since it is larger than the sum of its proper divisors (10269983207).

50991218305 is a wasteful number, since it uses less digits than its factorization.

50991218305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11956595.

The product of its (nonzero) digits is 97200, while the sum is 43.

The spelling of 50991218305 in words is "fifty billion, nine hundred ninety-one million, two hundred eighteen thousand, three hundred five".