16556973 has 8 divisors (see below), whose sum is σ = 22405728. Its totient is φ = 10873104.

The previous prime is 16556957. The next prime is 16556977. The reversal of 16556973 is 37965561.

It is a happy number.

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

It is not a de Polignac number, because 16556973 - 2⁴ = 16556957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556977) 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, 40986 + ... + 41387.

It is an arithmetic number, because the mean of its divisors is an integer number (2800716).

Almost surely, 2^16556973 is an apocalyptic number.

It is an amenable number.

16556973 is a deficient number, since it is larger than the sum of its proper divisors (5848755).

16556973 is an equidigital number, since it uses as much as digits as its factorization.

16556973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82443.

The product of its digits is 170100, while the sum is 42.

The square root of 16556973 is about 4069.0260505433. The cubic root of 16556973 is about 254.8748482368.

The spelling of 16556973 in words is "sixteen million, five hundred fifty-six thousand, nine hundred seventy-three".