66767069 has 2 divisors, whose sum is σ = 66767070. Its totient is φ = 66767068.

The previous prime is 66767053. The next prime is 66767111. The reversal of 66767069 is 96076766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 344569 = 8150^2 + 587^2 .

It is a cyclic number.

It is not a de Polignac number, because 66767069 - 2⁴ = 66767053 is a prime.

It is a super-2 number, since 2×66767069² = 8915683005701522, which contains 22 as substring.

It is a Sophie Germain 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 (66767009) 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, 33383534 + 33383535.

It is an arithmetic number, because the mean of its divisors is an integer number (33383535).

Almost surely, 2^66767069 is an apocalyptic number.

It is an amenable number.

66767069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66767069 is an equidigital number, since it uses as much as digits as its factorization.

66767069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 47.

The square root of 66767069 is about 8171.1118582479. Note that the first 3 decimals coincide. The cubic root of 66767069 is about 405.6835866937.

The spelling of 66767069 in words is "sixty-six million, seven hundred sixty-seven thousand, sixty-nine".