50439861865 has 4 divisors (see below), whose sum is σ = 60527834244. Its totient is φ = 40351889488.

The previous prime is 50439861863. The next prime is 50439861881. The reversal of 50439861865 is 56816893405.

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 13343946256 + 37095915609 = 115516^2 + 192603^2 .

It is a cyclic number.

It is not a de Polignac number, because 50439861865 - 2¹ = 50439861863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50439861863) 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, 5043986182 + ... + 5043986191.

It is an arithmetic number, because the mean of its divisors is an integer number (15131958561).

Almost surely, 2^50439861865 is an apocalyptic number.

It is an amenable number.

50439861865 is a deficient number, since it is larger than the sum of its proper divisors (10087972379).

50439861865 is a wasteful number, since it uses less digits than its factorization.

50439861865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10087972378.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 50439861865 in words is "fifty billion, four hundred thirty-nine million, eight hundred sixty-one thousand, eight hundred sixty-five".