66884369 has 2 divisors, whose sum is σ = 66884370. Its totient is φ = 66884368.

The previous prime is 66884333. The next prime is 66884381. The reversal of 66884369 is 96348866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42510400 + 24373969 = 6520^2 + 4937^2 .

It is a cyclic number.

It is not a de Polignac number, because 66884369 - 2⁸ = 66884113 is a prime.

It is a super-2 number, since 2×66884369² = 8947037633056322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66884269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33442184 + 33442185.

It is an arithmetic number, because the mean of its divisors is an integer number (33442185).

Almost surely, 2^66884369 is an apocalyptic number.

It is an amenable number.

66884369 is a deficient number, since it is larger than the sum of its proper divisors (1).

66884369 is an equidigital number, since it uses as much as digits as its factorization.

66884369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 50.

The square root of 66884369 is about 8178.2864342110. The cubic root of 66884369 is about 405.9210233271.

The spelling of 66884369 in words is "sixty-six million, eight hundred eighty-four thousand, three hundred sixty-nine".