50643243521 has 4 divisors (see below), whose sum is σ = 54538877652. Its totient is φ = 46747609392.

The previous prime is 50643243467. The next prime is 50643243529. The reversal of 50643243521 is 12534234605.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12534234605 = 5 ⋅2506846921.

It can be written as a sum of positive squares in 2 ways, for example, as 2116000000 + 48527243521 = 46000^2 + 220289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50643243521 is a prime.

It is a super-2 number, since 2×50643243521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50643243529) 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, 1947817046 + ... + 1947817071.

It is an arithmetic number, because the mean of its divisors is an integer number (13634719413).

Almost surely, 2^50643243521 is an apocalyptic number.

It is an amenable number.

50643243521 is a deficient number, since it is larger than the sum of its proper divisors (3895634131).

50643243521 is a wasteful number, since it uses less digits than its factorization.

50643243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895634130.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 50643243521 in words is "fifty billion, six hundred forty-three million, two hundred forty-three thousand, five hundred twenty-one".