16646497 has 4 divisors (see below), whose sum is σ = 19024576. Its totient is φ = 14268420.

The previous prime is 16646491. The next prime is 16646521. The reversal of 16646497 is 79464661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16646497 - 2¹¹ = 16644449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16646491) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1189029 + ... + 1189042.

It is an arithmetic number, because the mean of its divisors is an integer number (4756144).

Almost surely, 2^16646497 is an apocalyptic number.

It is an amenable number.

16646497 is a deficient number, since it is larger than the sum of its proper divisors (2378079).

16646497 is an equidigital number, since it uses as much as digits as its factorization.

16646497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378078.

The product of its digits is 217728, while the sum is 43.

The square root of 16646497 is about 4080.0118872376. The cubic root of 16646497 is about 255.3333944982. Note that the first 4 decimals are identical.

The spelling of 16646497 in words is "sixteen million, six hundred forty-six thousand, four hundred ninety-seven".