16655705040721 has 8 divisors (see below), whose sum is σ = 17490565917504. Its totient is φ = 15830069146320.

The previous prime is 16655705040701. The next prime is 16655705040749. The reversal of 16655705040721 is 12704050755661.

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

It is a cyclic number.

It is not a de Polignac number, because 16655705040721 - 2³⁷ = 16518266087249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16655705040701) 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, 2306241895 + ... + 2306249116.

It is an arithmetic number, because the mean of its divisors is an integer number (2186320739688).

Almost surely, 2^{16655705040721} is an apocalyptic number.

It is an amenable number.

16655705040721 is a deficient number, since it is larger than the sum of its proper divisors (834860876783).

16655705040721 is a wasteful number, since it uses less digits than its factorization.

16655705040721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612491191.

The product of its (nonzero) digits is 1764000, while the sum is 49.

The spelling of 16655705040721 in words is "sixteen trillion, six hundred fifty-five billion, seven hundred five million, forty thousand, seven hundred twenty-one".