1663787868 has 24 divisors (see below), whose sum is σ = 3884589072. Its totient is φ = 554250624.

The previous prime is 1663787861. The next prime is 1663787891. The reversal of 1663787868 is 8687873661.

1663787868 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663787861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22705 + ... + 61992.

It is an arithmetic number, because the mean of its divisors is an integer number (161857878).

Almost surely, 2^1663787868 is an apocalyptic number.

It is an amenable number.

1663787868 is an abundant number, since it is smaller than the sum of its proper divisors (2220801204).

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

1663787868 is a wasteful number, since it uses less digits than its factorization.

1663787868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86341 (or 86339 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 60.

The square root of 1663787868 is about 40789.5558691192. Note that the first 3 decimals coincide. The cubic root of 1663787868 is about 1184.9480694364.

The spelling of 1663787868 in words is "one billion, six hundred sixty-three million, seven hundred eighty-seven thousand, eight hundred sixty-eight".