16566901 has 12 divisors (see below), whose sum is σ = 18077472. Its totient is φ = 15175056.

The previous prime is 16566833. The next prime is 16566919. The reversal of 16566901 is 10966561.

It is not a de Polignac number, because 16566901 - 2¹⁷ = 16435829 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27930 + ... + 28516.

It is an arithmetic number, because the mean of its divisors is an integer number (1506456).

Almost surely, 2^16566901 is an apocalyptic number.

It is an amenable number.

16566901 is a deficient number, since it is larger than the sum of its proper divisors (1510571).

16566901 is a wasteful number, since it uses less digits than its factorization.

16566901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 16566901 is about 4070.2458156726. The cubic root of 16566901 is about 254.9257812968.

The spelling of 16566901 in words is "sixteen million, five hundred sixty-six thousand, nine hundred one".