1663312208 has 20 divisors (see below), whose sum is σ = 3309767700. Its totient is φ = 809178624.

The previous prime is 1663312199. The next prime is 1663312241. The reversal of 1663312208 is 8022133661.

It can be written as a sum of positive squares in 2 ways, for example, as 791409424 + 871902784 = 28132^2 + 29528^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1404233 + ... + 1405416.

It is an arithmetic number, because the mean of its divisors is an integer number (165488385).

Almost surely, 2^1663312208 is an apocalyptic number.

It is an amenable number.

1663312208 is a deficient number, since it is larger than the sum of its proper divisors (1646455492).

1663312208 is a wasteful number, since it uses less digits than its factorization.

1663312208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809694 (or 2809688 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 1663312208 is about 40783.7247931083. The cubic root of 1663312208 is about 1184.8351371469.

Adding to 1663312208 its reverse (8022133661), we get a palindrome (9685445869).

The spelling of 1663312208 in words is "one billion, six hundred sixty-three million, three hundred twelve thousand, two hundred eight".