50121316865 has 4 divisors (see below), whose sum is σ = 60145580244. Its totient is φ = 40097053488.

The previous prime is 50121316853. The next prime is 50121316867. The reversal of 50121316865 is 56861312105.

50121316865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33595957264 + 16525359601 = 183292^2 + 128551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50121316865 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (50121316867) 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, 5012131682 + ... + 5012131691.

It is an arithmetic number, because the mean of its divisors is an integer number (15036395061).

Almost surely, 2^50121316865 is an apocalyptic number.

It is an amenable number.

50121316865 is a deficient number, since it is larger than the sum of its proper divisors (10024263379).

50121316865 is a wasteful number, since it uses less digits than its factorization.

50121316865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10024263378.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 50121316865 in words is "fifty billion, one hundred twenty-one million, three hundred sixteen thousand, eight hundred sixty-five".