16434112985561 has 2 divisors, whose sum is σ = 16434112985562. Its totient is φ = 16434112985560.

The previous prime is 16434112985539. The next prime is 16434112985617. The reversal of 16434112985561 is 16558921143461.

It is an a-pointer prime, because the next prime (16434112985617) can be obtained adding 16434112985561 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12983453801536 + 3450659184025 = 3603256^2 + 1857595^2 .

It is a cyclic number.

It is not a de Polignac number, because 16434112985561 - 2⁶ = 16434112985497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16434112985497 and 16434112985506.

It is not a weakly prime, because it can be changed into another prime (16434112985261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8217056492780 + 8217056492781.

It is an arithmetic number, because the mean of its divisors is an integer number (8217056492781).

Almost surely, 2^{16434112985561} is an apocalyptic number.

It is an amenable number.

16434112985561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16434112985561 is an equidigital number, since it uses as much as digits as its factorization.

16434112985561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6220800, while the sum is 56.

The spelling of 16434112985561 in words is "sixteen trillion, four hundred thirty-four billion, one hundred twelve million, nine hundred eighty-five thousand, five hundred sixty-one".