50666881 has 2 divisors, whose sum is σ = 50666882. Its totient is φ = 50666880.

The previous prime is 50666879. The next prime is 50666909. The reversal of 50666881 is 18866605.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48776256 + 1890625 = 6984^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 50666881 - 2¹ = 50666879 is a prime.

It is a super-2 number, since 2×50666881² = 5134265660536322, which contains 22 as substring.

Together with 50666879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (50666821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25333440 + 25333441.

It is an arithmetic number, because the mean of its divisors is an integer number (25333441).

Almost surely, 2^50666881 is an apocalyptic number.

It is an amenable number.

50666881 is a deficient number, since it is larger than the sum of its proper divisors (1).

50666881 is an equidigital number, since it uses as much as digits as its factorization.

50666881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 50666881 is about 7118.0672236219. The cubic root of 50666881 is about 370.0337953061.

The spelling of 50666881 in words is "fifty million, six hundred sixty-six thousand, eight hundred eighty-one".