16663749 has 4 divisors (see below), whose sum is σ = 22218336. Its totient is φ = 11109164.

The previous prime is 16663697. The next prime is 16663763. The reversal of 16663749 is 94736661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94736661 = 3 ⋅31578887.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16663749 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16663749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16663849) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2777289 + ... + 2777294.

It is an arithmetic number, because the mean of its divisors is an integer number (5554584).

Almost surely, 2^16663749 is an apocalyptic number.

It is an amenable number.

16663749 is a deficient number, since it is larger than the sum of its proper divisors (5554587).

16663749 is an equidigital number, since it uses as much as digits as its factorization.

16663749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554586.

The product of its digits is 163296, while the sum is 42.

The square root of 16663749 is about 4082.1255492696. The cubic root of 16663749 is about 255.4215710247.

The spelling of 16663749 in words is "sixteen million, six hundred sixty-three thousand, seven hundred forty-nine".