16641554899 has 2 divisors, whose sum is σ = 16641554900. Its totient is φ = 16641554898.

The previous prime is 16641554893. The next prime is 16641554921. The reversal of 16641554899 is 99845514661.

It is a weak prime.

It is an emirp because it is prime and its reverse (99845514661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16641554899 - 2⁷ = 16641554771 is a prime.

It is not a weakly prime, because it can be changed into another prime (16641554893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320777449 + 8320777450.

It is an arithmetic number, because the mean of its divisors is an integer number (8320777450).

Almost surely, 2^16641554899 is an apocalyptic number.

16641554899 is a deficient number, since it is larger than the sum of its proper divisors (1).

16641554899 is an equidigital number, since it uses as much as digits as its factorization.

16641554899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200, while the sum is 58.

The spelling of 16641554899 in words is "sixteen billion, six hundred forty-one million, five hundred fifty-four thousand, eight hundred ninety-nine".