50320561565 has 4 divisors (see below), whose sum is σ = 60384673884. Its totient is φ = 40256449248.

The previous prime is 50320561547. The next prime is 50320561589. The reversal of 50320561565 is 56516502305.

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 23783499961 + 26537061604 = 154219^2 + 162902^2 .

It is a cyclic number.

It is not a de Polignac number, because 50320561565 - 2¹⁴ = 50320545181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5032056152 + ... + 5032056161.

It is an arithmetic number, because the mean of its divisors is an integer number (15096168471).

Almost surely, 2^50320561565 is an apocalyptic number.

It is an amenable number.

50320561565 is a deficient number, since it is larger than the sum of its proper divisors (10064112319).

50320561565 is a wasteful number, since it uses less digits than its factorization.

50320561565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10064112318.

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 50320561565 in words is "fifty billion, three hundred twenty million, five hundred sixty-one thousand, five hundred sixty-five".