1666990103 has 2 divisors, whose sum is σ = 1666990104. Its totient is φ = 1666990102.

The previous prime is 1666990051. The next prime is 1666990181. The reversal of 1666990103 is 3010996661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666990103 - 2¹² = 1666986007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666990183) 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, 833495051 + 833495052.

It is an arithmetic number, because the mean of its divisors is an integer number (833495052).

Almost surely, 2^1666990103 is an apocalyptic number.

1666990103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666990103 is an equidigital number, since it uses as much as digits as its factorization.

1666990103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 1666990103 is about 40828.7901241269. The cubic root of 1666990103 is about 1185.7077917712.

The spelling of 1666990103 in words is "one billion, six hundred sixty-six million, nine hundred ninety thousand, one hundred three".