65850881 has 2 divisors, whose sum is σ = 65850882. Its totient is φ = 65850880.

The previous prime is 65850847. The next prime is 65850899. The reversal of 65850881 is 18805856.

65850881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39891856 + 25959025 = 6316^2 + 5095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65850881 is a prime.

It is a super-2 number, since 2×65850881² = 8672677056952322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65850821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32925440 + 32925441.

It is an arithmetic number, because the mean of its divisors is an integer number (32925441).

Almost surely, 2^65850881 is an apocalyptic number.

It is an amenable number.

65850881 is a deficient number, since it is larger than the sum of its proper divisors (1).

65850881 is an equidigital number, since it uses as much as digits as its factorization.

65850881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 41.

The square root of 65850881 is about 8114.8555748085. The cubic root of 65850881 is about 403.8194161560.

The spelling of 65850881 in words is "sixty-five million, eight hundred fifty thousand, eight hundred eighty-one".