66253673 has 2 divisors, whose sum is σ = 66253674. Its totient is φ = 66253672.

The previous prime is 66253633. The next prime is 66253679. The reversal of 66253673 is 37635266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33500944 + 32752729 = 5788^2 + 5723^2 .

It is a cyclic number.

It is not a de Polignac number, because 66253673 - 2⁶ = 66253609 is a prime.

It is not a weakly prime, because it can be changed into another prime (66253679) 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, 33126836 + 33126837.

It is an arithmetic number, because the mean of its divisors is an integer number (33126837).

Almost surely, 2^66253673 is an apocalyptic number.

It is an amenable number.

66253673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66253673 is an equidigital number, since it uses as much as digits as its factorization.

66253673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 38.

The square root of 66253673 is about 8139.6359255190. The cubic root of 66253673 is about 404.6410944230.

The spelling of 66253673 in words is "sixty-six million, two hundred fifty-three thousand, six hundred seventy-three".