663981834 has 32 divisors (see below), whose sum is σ = 1362297024. Its totient is φ = 215631360.

The previous prime is 663981821. The next prime is 663981853. The reversal of 663981834 is 438189366.

663981834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105562 + ... + 111674.

It is an arithmetic number, because the mean of its divisors is an integer number (42571782).

Almost surely, 2^663981834 is an apocalyptic number.

663981834 is an abundant number, since it is smaller than the sum of its proper divisors (698315190).

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

663981834 is a wasteful number, since it uses less digits than its factorization.

663981834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6582.

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

The square root of 663981834 is about 25767.8449622781. The cubic root of 663981834 is about 872.4061782570.

The spelling of 663981834 in words is "six hundred sixty-three million, nine hundred eighty-one thousand, eight hundred thirty-four".