66253241 has 2 divisors, whose sum is σ = 66253242. Its totient is φ = 66253240.

The previous prime is 66253237. The next prime is 66253249. The reversal of 66253241 is 14235266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57229225 + 9024016 = 7565^2 + 3004^2 .

It is a cyclic number.

It is not a de Polignac number, because 66253241 - 2² = 66253237 is a prime.

It is not a weakly prime, because it can be changed into another prime (66253249) 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, 33126620 + 33126621.

It is an arithmetic number, because the mean of its divisors is an integer number (33126621).

Almost surely, 2^66253241 is an apocalyptic number.

It is an amenable number.

66253241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66253241 is an equidigital number, since it uses as much as digits as its factorization.

66253241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 66253241 is about 8139.6093886623. The cubic root of 66253241 is about 404.6402149480.

The spelling of 66253241 in words is "sixty-six million, two hundred fifty-three thousand, two hundred forty-one".