16664549771 has 2 divisors, whose sum is σ = 16664549772. Its totient is φ = 16664549770.

The previous prime is 16664549723. The next prime is 16664549777. The reversal of 16664549771 is 17794546661.

16664549771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16664549771 is a prime.

It is not a weakly prime, because it can be changed into another prime (16664549777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332274885 + 8332274886.

It is an arithmetic number, because the mean of its divisors is an integer number (8332274886).

Almost surely, 2^16664549771 is an apocalyptic number.

16664549771 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664549771 is an equidigital number, since it uses as much as digits as its factorization.

16664549771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 56.

The spelling of 16664549771 in words is "sixteen billion, six hundred sixty-four million, five hundred forty-nine thousand, seven hundred seventy-one".