66666000281 has 2 divisors, whose sum is σ = 66666000282. Its totient is φ = 66666000280.

The previous prime is 66666000253. The next prime is 66666000299. The reversal of 66666000281 is 18200066666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50362541056 + 16303459225 = 224416^2 + 127685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66666000281 is a prime.

It is a super-2 number, since 2×66666000281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66666000211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333000140 + 33333000141.

It is an arithmetic number, because the mean of its divisors is an integer number (33333000141).

Almost surely, 2^66666000281 is an apocalyptic number.

It is an amenable number.

66666000281 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666000281 is an equidigital number, since it uses as much as digits as its factorization.

66666000281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 66666000281 in words is "sixty-six billion, six hundred sixty-six million, two hundred eighty-one", and thus it is an aban number.