16655863914409 has 2 divisors, whose sum is σ = 16655863914410. Its totient is φ = 16655863914408.

The previous prime is 16655863914379. The next prime is 16655863914427. The reversal of 16655863914409 is 90441936855661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16168481210025 + 487382704384 = 4021005^2 + 698128^2 .

It is a cyclic number.

It is not a de Polignac number, because 16655863914409 - 2¹⁵ = 16655863881641 is a prime.

It is not a weakly prime, because it can be changed into another prime (16655863914479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8327931957204 + 8327931957205.

It is an arithmetic number, because the mean of its divisors is an integer number (8327931957205).

Almost surely, 2^{16655863914409} is an apocalyptic number.

It is an amenable number.

16655863914409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16655863914409 is an equidigital number, since it uses as much as digits as its factorization.

16655863914409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 167961600, while the sum is 67.

The spelling of 16655863914409 in words is "sixteen trillion, six hundred fifty-five billion, eight hundred sixty-three million, nine hundred fourteen thousand, four hundred nine".