50657721139 has 2 divisors, whose sum is σ = 50657721140. Its totient is φ = 50657721138.

The previous prime is 50657721119. The next prime is 50657721193. The reversal of 50657721139 is 93112775605.

It is a happy number.

Together with next prime (50657721193) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50657721139 is a prime.

It is not a weakly prime, because it can be changed into another prime (50657721119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25328860569 + 25328860570.

It is an arithmetic number, because the mean of its divisors is an integer number (25328860570).

Almost surely, 2^50657721139 is an apocalyptic number.

50657721139 is a deficient number, since it is larger than the sum of its proper divisors (1).

50657721139 is an equidigital number, since it uses as much as digits as its factorization.

50657721139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 46.

The spelling of 50657721139 in words is "fifty billion, six hundred fifty-seven million, seven hundred twenty-one thousand, one hundred thirty-nine".