16649945 has 16 divisors (see below), whose sum is σ = 22213632. Its totient is φ = 11897280.

The previous prime is 16649933. The next prime is 16649957. The reversal of 16649945 is 54994661.

It is an interprime number because it is at equal distance from previous prime (16649933) and next prime (16649957).

It is a de Polignac number, because none of the positive numbers 2^k-16649945 is a prime.

It is a cake number, because a cake can be divided into 16649945 parts by 464 planar cuts.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16649896 and 16649905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2117 + ... + 6146.

It is an arithmetic number, because the mean of its divisors is an integer number (1388352).

Almost surely, 2^16649945 is an apocalyptic number.

It is an amenable number.

16649945 is a deficient number, since it is larger than the sum of its proper divisors (5563687).

16649945 is a wasteful number, since it uses less digits than its factorization.

16649945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8312.

The product of its digits is 233280, while the sum is 44.

The square root of 16649945 is about 4080.4344131477. The cubic root of 16649945 is about 255.3510224065.

The spelling of 16649945 in words is "sixteen million, six hundred forty-nine thousand, nine hundred forty-five".