16681613729558 has 8 divisors (see below), whose sum is σ = 25094118075600. Its totient is φ = 8316907704360.

The previous prime is 16681613729549. The next prime is 16681613729567. The reversal of 16681613729558 is 85592731618661.

It is an interprime number because it is at equal distance from previous prime (16681613729549) and next prime (16681613729567).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11949579338 + ... + 11949580733.

It is an arithmetic number, because the mean of its divisors is an integer number (3136764759450).

Almost surely, 2^{16681613729558} is an apocalyptic number.

16681613729558 is a deficient number, since it is larger than the sum of its proper divisors (8412504346042).

16681613729558 is a wasteful number, since it uses less digits than its factorization.

16681613729558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23899160422.

The product of its digits is 130636800, while the sum is 68.

The spelling of 16681613729558 in words is "sixteen trillion, six hundred eighty-one billion, six hundred thirteen million, seven hundred twenty-nine thousand, five hundred fifty-eight".