16985052336661 has 2 divisors, whose sum is σ = 16985052336662. Its totient is φ = 16985052336660.

The previous prime is 16985052336647. The next prime is 16985052336673. The reversal of 16985052336661 is 16663325058961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10737582080625 + 6247470256036 = 3276825^2 + 2499494^2 .

It is a cyclic number.

It is not a de Polignac number, because 16985052336661 - 2⁹ = 16985052336149 is a prime.

It is a super-2 number, since 2×16985052336661² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16985052336661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16985052336691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8492526168330 + 8492526168331.

It is an arithmetic number, because the mean of its divisors is an integer number (8492526168331).

Almost surely, 2^{16985052336661} is an apocalyptic number.

It is an amenable number.

16985052336661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16985052336661 is an equidigital number, since it uses as much as digits as its factorization.

16985052336661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41990400, while the sum is 61.

The spelling of 16985052336661 in words is "sixteen trillion, nine hundred eighty-five billion, fifty-two million, three hundred thirty-six thousand, six hundred sixty-one".