66576281 has 2 divisors, whose sum is σ = 66576282. Its totient is φ = 66576280.

The previous prime is 66576269. The next prime is 66576311. The reversal of 66576281 is 18267566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 18412681 = 6940^2 + 4291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66576281 is a prime.

It is a super-2 number, since 2×66576281² = 8864802383581922, 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 (66576481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33288140 + 33288141.

It is an arithmetic number, because the mean of its divisors is an integer number (33288141).

Almost surely, 2^66576281 is an apocalyptic number.

It is an amenable number.

66576281 is a deficient number, since it is larger than the sum of its proper divisors (1).

66576281 is an equidigital number, since it uses as much as digits as its factorization.

66576281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 66576281 is about 8159.4289628625. The cubic root of 66576281 is about 405.2968022001.

The spelling of 66576281 in words is "sixty-six million, five hundred seventy-six thousand, two hundred eighty-one".