16556021545043 has 8 divisors (see below), whose sum is σ = 16827991377120. Its totient is φ = 16284069766080.

The previous prime is 16556021545039. The next prime is 16556021545073. The reversal of 16556021545043 is 34054512065561.

It is a happy number.

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 16556021545043 - 2² = 16556021545039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16556021545073) 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, 2657855 + ... + 6338472.

It is an arithmetic number, because the mean of its divisors is an integer number (2103498922140).

Almost surely, 2^{16556021545043} is an apocalyptic number.

16556021545043 is a deficient number, since it is larger than the sum of its proper divisors (271969832077).

16556021545043 is an equidigital number, since it uses as much as digits as its factorization.

16556021545043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9026557.

The product of its (nonzero) digits is 2160000, while the sum is 47.

The spelling of 16556021545043 in words is "sixteen trillion, five hundred fifty-six billion, twenty-one million, five hundred forty-five thousand, forty-three".