50657721138 has 64 divisors (see below), whose sum is σ = 115873873920. Its totient is φ = 16396397136.

The previous prime is 50657721119. The next prime is 50657721139. The reversal of 50657721138 is 83112775605.

It is a happy number.

50657721138 is a `hidden beast` number, since 50 + 6 + 577 + 21 + 1 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 50657721093 and 50657721102.

It is not an unprimeable number, because it can be changed into a prime (50657721139) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 243745 + ... + 400907.

It is an arithmetic number, because the mean of its divisors is an integer number (1810529280).

Almost surely, 2^50657721138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 50657721138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57936936960).

50657721138 is an abundant number, since it is smaller than the sum of its proper divisors (65216152782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

50657721138 is a wasteful number, since it uses less digits than its factorization.

50657721138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157348 (or 157342 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 50657721138 in words is "fifty billion, six hundred fifty-seven million, seven hundred twenty-one thousand, one hundred thirty-eight".