50861721697 has 2 divisors, whose sum is σ = 50861721698. Its totient is φ = 50861721696.

The previous prime is 50861721679. The next prime is 50861721709. The reversal of 50861721697 is 79612716805.

Together with previous prime (50861721679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27649370961 + 23212350736 = 166281^2 + 152356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50861721697 is a prime.

It is not a weakly prime, because it can be changed into another prime (50861721637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25430860848 + 25430860849.

It is an arithmetic number, because the mean of its divisors is an integer number (25430860849).

Almost surely, 2^50861721697 is an apocalyptic number.

It is an amenable number.

50861721697 is a deficient number, since it is larger than the sum of its proper divisors (1).

50861721697 is an equidigital number, since it uses as much as digits as its factorization.

50861721697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 50861721697 in words is "fifty billion, eight hundred sixty-one million, seven hundred twenty-one thousand, six hundred ninety-seven".