66944653 has 2 divisors, whose sum is σ = 66944654. Its totient is φ = 66944652.

The previous prime is 66944629. The next prime is 66944681. The reversal of 66944653 is 35644966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55398249 + 11546404 = 7443^2 + 3398^2 .

It is a cyclic number.

It is not a de Polignac number, because 66944653 - 2¹³ = 66936461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66945653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33472326 + 33472327.

It is an arithmetic number, because the mean of its divisors is an integer number (33472327).

Almost surely, 2^66944653 is an apocalyptic number.

It is an amenable number.

66944653 is a deficient number, since it is larger than the sum of its proper divisors (1).

66944653 is an equidigital number, since it uses as much as digits as its factorization.

66944653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 43.

The square root of 66944653 is about 8181.9712172557. The cubic root of 66944653 is about 406.0429411738.

The spelling of 66944653 in words is "sixty-six million, nine hundred forty-four thousand, six hundred fifty-three".