66563369 has 2 divisors, whose sum is σ = 66563370. Its totient is φ = 66563368.

The previous prime is 66563359. The next prime is 66563401. The reversal of 66563369 is 96336566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42406144 + 24157225 = 6512^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 66563369 - 2²⁴ = 49786153 is a prime.

It is a super-2 number, since 2×66563369² = 8861364185260322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66563359) 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, 33281684 + 33281685.

It is an arithmetic number, because the mean of its divisors is an integer number (33281685).

Almost surely, 2^66563369 is an apocalyptic number.

It is an amenable number.

66563369 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563369 is an equidigital number, since it uses as much as digits as its factorization.

66563369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 44.

The square root of 66563369 is about 8158.6376926543. The cubic root of 66563369 is about 405.2705990209.

The spelling of 66563369 in words is "sixty-six million, five hundred sixty-three thousand, three hundred sixty-nine".