16446643 has 2 divisors, whose sum is σ = 16446644. Its totient is φ = 16446642.

The previous prime is 16446629. The next prime is 16446659. The reversal of 16446643 is 34664461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16446643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16446599 and 16446608.

It is not a weakly prime, because it can be changed into another prime (16446943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8223321 + 8223322.

It is an arithmetic number, because the mean of its divisors is an integer number (8223322).

Almost surely, 2^16446643 is an apocalyptic number.

16446643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16446643 is an equidigital number, since it uses as much as digits as its factorization.

16446643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 34.

The square root of 16446643 is about 4055.4460913690. The cubic root of 16446643 is about 254.3074531436.

The spelling of 16446643 in words is "sixteen million, four hundred forty-six thousand, six hundred forty-three".