16564945 has 16 divisors (see below), whose sum is σ = 21461760. Its totient is φ = 12236224.

The previous prime is 16564927. The next prime is 16564963. The reversal of 16564945 is 54946561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16564927) and next prime (16564963).

It is a cyclic number.

It is not a de Polignac number, because 16564945 - 2⁹ = 16564433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16564898 and 16564907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852 + ... + 5818.

It is an arithmetic number, because the mean of its divisors is an integer number (1341360).

Almost surely, 2^16564945 is an apocalyptic number.

It is an amenable number.

16564945 is a deficient number, since it is larger than the sum of its proper divisors (4896815).

16564945 is a wasteful number, since it uses less digits than its factorization.

16564945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5024.

The product of its digits is 129600, while the sum is 40.

The square root of 16564945 is about 4070.0055282518. The cubic root of 16564945 is about 254.9157481499.

The spelling of 16564945 in words is "sixteen million, five hundred sixty-four thousand, nine hundred forty-five".