16566949 has 12 divisors (see below), whose sum is σ = 19380000. Its totient is φ = 14120568.

The previous prime is 16566947. The next prime is 16566961. The reversal of 16566949 is 94966561.

It is not a de Polignac number, because 16566949 - 2¹ = 16566947 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 16566899 and 16566908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566941) 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, 8902 + ... + 10600.

It is an arithmetic number, because the mean of its divisors is an integer number (1615000).

Almost surely, 2^16566949 is an apocalyptic number.

It is an amenable number.

16566949 is a deficient number, since it is larger than the sum of its proper divisors (2813051).

16566949 is a wasteful number, since it uses less digits than its factorization.

16566949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912 (or 1905 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The square root of 16566949 is about 4070.2517121181. The cubic root of 16566949 is about 254.9260274991.

The spelling of 16566949 in words is "sixteen million, five hundred sixty-six thousand, nine hundred forty-nine".