16660388908447 has 2 divisors, whose sum is σ = 16660388908448. Its totient is φ = 16660388908446.

The previous prime is 16660388908399. The next prime is 16660388908459. The reversal of 16660388908447 is 74480988306661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16660388908447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16660388900447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330194454223 + 8330194454224.

It is an arithmetic number, because the mean of its divisors is an integer number (8330194454224).

Almost surely, 2^{16660388908447} is an apocalyptic number.

16660388908447 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660388908447 is an equidigital number, since it uses as much as digits as its factorization.

16660388908447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 334430208, while the sum is 70.

The spelling of 16660388908447 in words is "sixteen trillion, six hundred sixty billion, three hundred eighty-eight million, nine hundred eight thousand, four hundred forty-seven".