16662749 has 4 divisors (see below), whose sum is σ = 16670940. Its totient is φ = 16654560.

The previous prime is 16662743. The next prime is 16662773. The reversal of 16662749 is 94726661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13823524 + 2839225 = 3718^2 + 1685^2 .

It is a cyclic number.

It is not a de Polignac number, because 16662749 - 2¹⁶ = 16597213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16662743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1559 + ... + 5979.

It is an arithmetic number, because the mean of its divisors is an integer number (4167735).

Almost surely, 2^16662749 is an apocalyptic number.

It is an amenable number.

16662749 is a deficient number, since it is larger than the sum of its proper divisors (8191).

16662749 is an equidigital number, since it uses as much as digits as its factorization.

16662749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8190.

The product of its digits is 108864, while the sum is 41.

The square root of 16662749 is about 4082.0030622233. The cubic root of 16662749 is about 255.4164615967.

The spelling of 16662749 in words is "sixteen million, six hundred sixty-two thousand, seven hundred forty-nine".