1663688303 has 4 divisors (see below), whose sum is σ = 1682381520. Its totient is φ = 1644995088.

The previous prime is 1663688291. The next prime is 1663688309. The reversal of 1663688303 is 3038863661.

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 1663688303 - 2⁴ = 1663688287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663688309) 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, 9346475 + ... + 9346652.

It is an arithmetic number, because the mean of its divisors is an integer number (420595380).

Almost surely, 2^1663688303 is an apocalyptic number.

1663688303 is a deficient number, since it is larger than the sum of its proper divisors (18693217).

1663688303 is an equidigital number, since it uses as much as digits as its factorization.

1663688303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18693216.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 1663688303 is about 40788.3353791252. The cubic root of 1663688303 is about 1184.9244322668.

The spelling of 1663688303 in words is "one billion, six hundred sixty-three million, six hundred eighty-eight thousand, three hundred three".