16681863540 has 96 divisors (see below), whose sum is σ = 47029651200. Its totient is φ = 4418067456.

The previous prime is 16681863521. The next prime is 16681863563. The reversal of 16681863540 is 4536818661.

It is a self number, because there is not a number n which added to its sum of digits gives 16681863540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9515304 + ... + 9517056.

It is an arithmetic number, because the mean of its divisors is an integer number (489892200).

Almost surely, 2^16681863540 is an apocalyptic number.

16681863540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16681863540 is an abundant number, since it is smaller than the sum of its proper divisors (30347787660).

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

16681863540 is a wasteful number, since it uses less digits than its factorization.

16681863540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761 (or 2759 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 16681863540 in words is "sixteen billion, six hundred eighty-one million, eight hundred sixty-three thousand, five hundred forty".