66983261 has 2 divisors, whose sum is σ = 66983262. Its totient is φ = 66983260.

The previous prime is 66983251. The next prime is 66983327. The reversal of 66983261 is 16238966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40005625 + 26977636 = 6325^2 + 5194^2 .

It is a cyclic number.

It is not a de Polignac number, because 66983261 - 2⁶ = 66983197 is a prime.

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 (66983251) 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, 33491630 + 33491631.

It is an arithmetic number, because the mean of its divisors is an integer number (33491631).

Almost surely, 2^66983261 is an apocalyptic number.

It is an amenable number.

66983261 is a deficient number, since it is larger than the sum of its proper divisors (1).

66983261 is an equidigital number, since it uses as much as digits as its factorization.

66983261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 66983261 is about 8184.3302108358. The cubic root of 66983261 is about 406.1209832206.

The spelling of 66983261 in words is "sixty-six million, nine hundred eighty-three thousand, two hundred sixty-one".