50518125521 has 4 divisors (see below), whose sum is σ = 50630638500. Its totient is φ = 50405612544.

The previous prime is 50518125503. The next prime is 50518125551. The reversal of 50518125521 is 12552181505.

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 25478544400 + 25039581121 = 159620^2 + 158239^2 .

It is a cyclic number.

It is not a de Polignac number, because 50518125521 - 2⁶ = 50518125457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50518125551) 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, 56255816 + ... + 56256713.

It is an arithmetic number, because the mean of its divisors is an integer number (12657659625).

Almost surely, 2^50518125521 is an apocalyptic number.

It is an amenable number.

50518125521 is a deficient number, since it is larger than the sum of its proper divisors (112512979).

50518125521 is a wasteful number, since it uses less digits than its factorization.

50518125521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112512978.

The product of its (nonzero) digits is 20000, while the sum is 35.

The spelling of 50518125521 in words is "fifty billion, five hundred eighteen million, one hundred twenty-five thousand, five hundred twenty-one".