66500069 has 2 divisors, whose sum is σ = 66500070. Its totient is φ = 66500068.

The previous prime is 66500051. The next prime is 66500081. The reversal of 66500069 is 96000566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64609444 + 1890625 = 8038^2 + 1375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66500069 is a prime.

It is a super-2 number, since 2×66500069² = 8844518354009522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66500009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250034 + 33250035.

It is an arithmetic number, because the mean of its divisors is an integer number (33250035).

Almost surely, 2^66500069 is an apocalyptic number.

It is an amenable number.

66500069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66500069 is an equidigital number, since it uses as much as digits as its factorization.

66500069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 66500069 is about 8154.7574458104. The cubic root of 66500069 is about 405.1420910764.

The spelling of 66500069 in words is "sixty-six million, five hundred thousand, sixty-nine".