1666281103 has 2 divisors, whose sum is σ = 1666281104. Its totient is φ = 1666281102.

The previous prime is 1666281073. The next prime is 1666281109. The reversal of 1666281103 is 3011826661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666281103 - 2⁹ = 1666280591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666281109) 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, 833140551 + 833140552.

It is an arithmetic number, because the mean of its divisors is an integer number (833140552).

Almost surely, 2^1666281103 is an apocalyptic number.

1666281103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666281103 is an equidigital number, since it uses as much as digits as its factorization.

1666281103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1666281103 is about 40820.1066020166. The cubic root of 1666281103 is about 1185.5396671906.

The spelling of 1666281103 in words is "one billion, six hundred sixty-six million, two hundred eighty-one thousand, one hundred three".