65669969 has 2 divisors, whose sum is σ = 65669970. Its totient is φ = 65669968.

The previous prime is 65669957. The next prime is 65669971. The reversal of 65669969 is 96996656.

65669969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65399569 + 270400 = 8087^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 65669969 - 2⁴ = 65669953 is a prime.

It is a super-2 number, since 2×65669969² = 8625089656921922, which contains 22 as substring.

Together with 65669971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65669939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32834984 + 32834985.

It is an arithmetic number, because the mean of its divisors is an integer number (32834985).

Almost surely, 2^65669969 is an apocalyptic number.

It is an amenable number.

65669969 is a deficient number, since it is larger than the sum of its proper divisors (1).

65669969 is an equidigital number, since it uses as much as digits as its factorization.

65669969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920, while the sum is 56.

The square root of 65669969 is about 8103.7009446302. The cubic root of 65669969 is about 403.4492728797.

The spelling of 65669969 in words is "sixty-five million, six hundred sixty-nine thousand, nine hundred sixty-nine".