50666821 has 2 divisors, whose sum is σ = 50666822. Its totient is φ = 50666820.

The previous prime is 50666813. The next prime is 50666831. The reversal of 50666821 is 12866605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37344321 + 13322500 = 6111^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 50666821 - 2³ = 50666813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50666831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25333410 + 25333411.

It is an arithmetic number, because the mean of its divisors is an integer number (25333411).

Almost surely, 2^50666821 is an apocalyptic number.

It is an amenable number.

50666821 is a deficient number, since it is larger than the sum of its proper divisors (1).

50666821 is an equidigital number, since it uses as much as digits as its factorization.

50666821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 50666821 is about 7118.0630089934. The cubic root of 50666821 is about 370.0336492407.

The spelling of 50666821 in words is "fifty million, six hundred sixty-six thousand, eight hundred twenty-one".