1663240668 has 12 divisors (see below), whose sum is σ = 3880894920. Its totient is φ = 554413552.

The previous prime is 1663240643. The next prime is 1663240669. The reversal of 1663240668 is 8660423661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663240669) 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, 69301683 + ... + 69301706.

It is an arithmetic number, because the mean of its divisors is an integer number (323407910).

Almost surely, 2^1663240668 is an apocalyptic number.

It is an amenable number.

1663240668 is an abundant number, since it is smaller than the sum of its proper divisors (2217654252).

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

1663240668 is a wasteful number, since it uses less digits than its factorization.

1663240668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138603396 (or 138603394 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 1663240668 is about 40782.8477181278. The cubic root of 1663240668 is about 1184.8181500933.

The spelling of 1663240668 in words is "one billion, six hundred sixty-three million, two hundred forty thousand, six hundred sixty-eight".