16681563187658 has 16 divisors (see below), whose sum is σ = 25433121275016. Its totient is φ = 8203862269440.

The previous prime is 16681563187649. The next prime is 16681563187711. The reversal of 16681563187658 is 85678136518661.

It can be written as a sum of positive squares in 4 ways, for example, as 14648477892889 + 2033085294769 = 3827333^2 + 1425863^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16681563187591 and 16681563187600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3963410 + ... + 7005122.

Almost surely, 2^{16681563187658} is an apocalyptic number.

16681563187658 is a deficient number, since it is larger than the sum of its proper divisors (8751558087358).

16681563187658 is a wasteful number, since it uses less digits than its factorization.

16681563187658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086729.

The product of its digits is 348364800, while the sum is 71.

The spelling of 16681563187658 in words is "sixteen trillion, six hundred eighty-one billion, five hundred sixty-three million, one hundred eighty-seven thousand, six hundred fifty-eight".