16664749 has 2 divisors, whose sum is σ = 16664750. Its totient is φ = 16664748.

The previous prime is 16664741. The next prime is 16664761. The reversal of 16664749 is 94746661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16662724 + 2025 = 4082^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 16664749 - 2³ = 16664741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16664741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332374 + 8332375.

It is an arithmetic number, because the mean of its divisors is an integer number (8332375).

Almost surely, 2^16664749 is an apocalyptic number.

It is an amenable number.

16664749 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664749 is an equidigital number, since it uses as much as digits as its factorization.

16664749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 16664749 is about 4082.2480326408. The cubic root of 16664749 is about 255.4266802484.

The spelling of 16664749 in words is "sixteen million, six hundred sixty-four thousand, seven hundred forty-nine".