1641666503 has 2 divisors, whose sum is σ = 1641666504. Its totient is φ = 1641666502.

The previous prime is 1641666491. The next prime is 1641666511. The reversal of 1641666503 is 3056661461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641666503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641666203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820833251 + 820833252.

It is an arithmetic number, because the mean of its divisors is an integer number (820833252).

Almost surely, 2^1641666503 is an apocalyptic number.

1641666503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641666503 is an equidigital number, since it uses as much as digits as its factorization.

1641666503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1641666503 is about 40517.4839174399. The cubic root of 1641666503 is about 1179.6730165050.

The spelling of 1641666503 in words is "one billion, six hundred forty-one million, six hundred sixty-six thousand, five hundred three".