16684167144949 has 2 divisors, whose sum is σ = 16684167144950. Its totient is φ = 16684167144948.

The previous prime is 16684167144947. The next prime is 16684167144979. The reversal of 16684167144949 is 94944176148661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16246889132049 + 437278012900 = 4030743^2 + 661270^2 .

It is a cyclic number.

It is not a de Polignac number, because 16684167144949 - 2¹ = 16684167144947 is a prime.

It is a super-2 number, since 2×16684167144949² (a number of 27 digits) contains 22 as substring.

Together with 16684167144947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16684167144947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342083572474 + 8342083572475.

It is an arithmetic number, because the mean of its divisors is an integer number (8342083572475).

Almost surely, 2^{16684167144949} is an apocalyptic number.

It is an amenable number.

16684167144949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16684167144949 is an equidigital number, since it uses as much as digits as its factorization.

16684167144949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 250822656, while the sum is 70.

The spelling of 16684167144949 in words is "sixteen trillion, six hundred eighty-four billion, one hundred sixty-seven million, one hundred forty-four thousand, nine hundred forty-nine".