66050581 has 2 divisors, whose sum is σ = 66050582. Its totient is φ = 66050580.

The previous prime is 66050539. The next prime is 66050599. The reversal of 66050581 is 18505066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34409956 + 31640625 = 5866^2 + 5625^2 .

It is a cyclic number.

It is not a de Polignac number, because 66050581 - 2²³ = 57661973 is a prime.

It is a super-2 number, since 2×66050581² = 8725358500875122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66050681) 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, 33025290 + 33025291.

It is an arithmetic number, because the mean of its divisors is an integer number (33025291).

Almost surely, 2^66050581 is an apocalyptic number.

It is an amenable number.

66050581 is a deficient number, since it is larger than the sum of its proper divisors (1).

66050581 is an equidigital number, since it uses as much as digits as its factorization.

66050581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 66050581 is about 8127.1508537740. The cubic root of 66050581 is about 404.2272130548.

The spelling of 66050581 in words is "sixty-six million, fifty thousand, five hundred eighty-one".