1663917648 has 20 divisors (see below), whose sum is σ = 4298454048. Its totient is φ = 554639200.

The previous prime is 1663917581. The next prime is 1663917649. The reversal of 1663917648 is 8467193661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663917648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663917649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17332428 + ... + 17332523.

Almost surely, 2^1663917648 is an apocalyptic number.

It is an amenable number.

1663917648 is an abundant number, since it is smaller than the sum of its proper divisors (2634536400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663917648 is a wasteful number, since it uses less digits than its factorization.

1663917648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34664962 (or 34664956 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The square root of 1663917648 is about 40791.1466865054. The cubic root of 1663917648 is about 1184.9788783645.

The spelling of 1663917648 in words is "one billion, six hundred sixty-three million, nine hundred seventeen thousand, six hundred forty-eight".