50561209837 has 2 divisors, whose sum is σ = 50561209838. Its totient is φ = 50561209836.

The previous prime is 50561209819. The next prime is 50561209861. The reversal of 50561209837 is 73890216505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50414169961 + 147039876 = 224531^2 + 12126^2 .

It is a cyclic number.

It is not a de Polignac number, because 50561209837 - 2⁷ = 50561209709 is a prime.

It is a super-2 number, since 2×50561209837² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50561209807) 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 as a sum of consecutive naturals, namely, 25280604918 + 25280604919.

It is an arithmetic number, because the mean of its divisors is an integer number (25280604919).

Almost surely, 2^50561209837 is an apocalyptic number.

It is an amenable number.

50561209837 is a deficient number, since it is larger than the sum of its proper divisors (1).

50561209837 is an equidigital number, since it uses as much as digits as its factorization.

50561209837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 50561209837 in words is "fifty billion, five hundred sixty-one million, two hundred nine thousand, eight hundred thirty-seven".