66380969 has 2 divisors, whose sum is σ = 66380970. Its totient is φ = 66380968.

The previous prime is 66380957. The next prime is 66381011. The reversal of 66380969 is 96908366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64722025 + 1658944 = 8045^2 + 1288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66380969 is a prime.

It is a super-2 number, since 2×66380969² = 8812866090757922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66380939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33190484 + 33190485.

It is an arithmetic number, because the mean of its divisors is an integer number (33190485).

Almost surely, 2^66380969 is an apocalyptic number.

It is an amenable number.

66380969 is a deficient number, since it is larger than the sum of its proper divisors (1).

66380969 is an equidigital number, since it uses as much as digits as its factorization.

66380969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 66380969 is about 8147.4516874910. The cubic root of 66380969 is about 404.9000800090.

The spelling of 66380969 in words is "sixty-six million, three hundred eighty thousand, nine hundred sixty-nine".