16320866 has 4 divisors (see below), whose sum is σ = 24481302. Its totient is φ = 8160432.

The previous prime is 16320809. The next prime is 16320919. The reversal of 16320866 is 66802361.

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

It can be written as a sum of positive squares in only one way, i.e., 13359025 + 2961841 = 3655^2 + 1721^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080215 + ... + 4080218.

Almost surely, 2^16320866 is an apocalyptic number.

16320866 is a deficient number, since it is larger than the sum of its proper divisors (8160436).

16320866 is an equidigital number, since it uses as much as digits as its factorization.

16320866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8160435.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 16320866 is about 4039.9091573945. The cubic root of 16320866 is about 253.6575147276.

The spelling of 16320866 in words is "sixteen million, three hundred twenty thousand, eight hundred sixty-six".