1663948803 has 18 divisors (see below), whose sum is σ = 2439764236. Its totient is φ = 1007982800.

The previous prime is 1663948801. The next prime is 1663948861. The reversal of 1663948803 is 3088493661.

It is not a de Polignac number, because 1663948803 - 2¹ = 1663948801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663948801) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 776113 + ... + 778253.

Almost surely, 2^1663948803 is an apocalyptic number.

1663948803 is a deficient number, since it is larger than the sum of its proper divisors (775815433).

1663948803 is an frugal number, since it uses more digits than its factorization.

1663948803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307 (or 2155 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 1663948803 is about 40791.5285690546. The cubic root of 1663948803 is about 1184.9862741204.

Multiplying 1663948803 by its sum of digits (48), we get a square (79869542544 = 282612²).

The spelling of 1663948803 in words is "one billion, six hundred sixty-three million, nine hundred forty-eight thousand, eight hundred three".