16764661 has 2 divisors, whose sum is σ = 16764662. Its totient is φ = 16764660.

The previous prime is 16764659. The next prime is 16764701. The reversal of 16764661 is 16646761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 844561 = 3990^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 16764661 - 2¹ = 16764659 is a prime.

Together with 16764659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16764661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16764361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382330 + 8382331.

It is an arithmetic number, because the mean of its divisors is an integer number (8382331).

Almost surely, 2^16764661 is an apocalyptic number.

It is an amenable number.

16764661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16764661 is an equidigital number, since it uses as much as digits as its factorization.

16764661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 16764661 is about 4094.4671203955. The cubic root of 16764661 is about 255.9361260321.

The spelling of 16764661 in words is "sixteen million, seven hundred sixty-four thousand, six hundred sixty-one".