66045869 has 2 divisors, whose sum is σ = 66045870. Its totient is φ = 66045868.

The previous prime is 66045829. The next prime is 66045907. The reversal of 66045869 is 96854066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44049769 + 21996100 = 6637^2 + 4690^2 .

It is a cyclic number.

It is not a de Polignac number, because 66045869 - 2²⁰ = 64997293 is a prime.

It is a super-2 number, since 2×66045869² = 8724113623930322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66045829) 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, 33022934 + 33022935.

It is an arithmetic number, because the mean of its divisors is an integer number (33022935).

Almost surely, 2^66045869 is an apocalyptic number.

It is an amenable number.

66045869 is a deficient number, since it is larger than the sum of its proper divisors (1).

66045869 is an equidigital number, since it uses as much as digits as its factorization.

66045869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 66045869 is about 8126.8609561134. The cubic root of 66045869 is about 404.2176004019.

The spelling of 66045869 in words is "sixty-six million, forty-five thousand, eight hundred sixty-nine".