280666849 has 2 divisors, whose sum is σ = 280666850. Its totient is φ = 280666848.

The previous prime is 280666817. The next prime is 280666933. The reversal of 280666849 is 948666082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260596449 + 20070400 = 16143^2 + 4480^2 .

It is a cyclic number.

It is not a de Polignac number, because 280666849 - 2⁵ = 280666817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (280666249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140333424 + 140333425.

It is an arithmetic number, because the mean of its divisors is an integer number (140333425).

Almost surely, 2^280666849 is an apocalyptic number.

It is an amenable number.

280666849 is a deficient number, since it is larger than the sum of its proper divisors (1).

280666849 is an equidigital number, since it uses as much as digits as its factorization.

280666849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 280666849 is about 16753.1146059472. The cubic root of 280666849 is about 654.7322091605.

The spelling of 280666849 in words is "two hundred eighty million, six hundred sixty-six thousand, eight hundred forty-nine".