1663491003 has 4 divisors (see below), whose sum is σ = 2217988008. Its totient is φ = 1108994000.

The previous prime is 1663490989. The next prime is 1663491013. The reversal of 1663491003 is 3001943661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1663491003 - 2¹³ = 1663482811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1663491013) 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 in 3 ways as a sum of consecutive naturals, for example, 277248498 + ... + 277248503.

It is an arithmetic number, because the mean of its divisors is an integer number (554497002).

Almost surely, 2^1663491003 is an apocalyptic number.

1663491003 is a deficient number, since it is larger than the sum of its proper divisors (554497005).

1663491003 is an equidigital number, since it uses as much as digits as its factorization.

1663491003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554497004.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 1663491003 is about 40785.9167237908. The cubic root of 1663491003 is about 1184.8775895916.

The spelling of 1663491003 in words is "one billion, six hundred sixty-three million, four hundred ninety-one thousand, three".