16655645805823 has 4 divisors (see below), whose sum is σ = 16708187275560. Its totient is φ = 16603104336088.

The previous prime is 16655645805817. The next prime is 16655645805859. The reversal of 16655645805823 is 32850854655661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16655645805823 - 2³⁷ = 16518206852351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16655645805803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26270734393 + ... + 26270735026.

It is an arithmetic number, because the mean of its divisors is an integer number (4177046818890).

Almost surely, 2^{16655645805823} is an apocalyptic number.

16655645805823 is a deficient number, since it is larger than the sum of its proper divisors (52541469737).

16655645805823 is an equidigital number, since it uses as much as digits as its factorization.

16655645805823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52541469736.

The product of its (nonzero) digits is 207360000, while the sum is 64.

The spelling of 16655645805823 in words is "sixteen trillion, six hundred fifty-five billion, six hundred forty-five million, eight hundred five thousand, eight hundred twenty-three".