66050401 has 2 divisors, whose sum is σ = 66050402. Its totient is φ = 66050400.

The previous prime is 66050393. The next prime is 66050407. The reversal of 66050401 is 10405066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37149025 + 28901376 = 6095^2 + 5376^2 .

It is a cyclic number.

It is not a de Polignac number, because 66050401 - 2³ = 66050393 is a prime.

It is not a weakly prime, because it can be changed into another prime (66050407) 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, 33025200 + 33025201.

It is an arithmetic number, because the mean of its divisors is an integer number (33025201).

Almost surely, 2^66050401 is an apocalyptic number.

It is an amenable number.

66050401 is a deficient number, since it is larger than the sum of its proper divisors (1).

66050401 is an equidigital number, since it uses as much as digits as its factorization.

66050401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66050401 is about 8127.1397797749. The cubic root of 66050401 is about 404.2268458565.

Adding to 66050401 its reverse (10405066), we get a palindrome (76455467).

The spelling of 66050401 in words is "sixty-six million, fifty thousand, four hundred one".