1684853948969 has 2 divisors, whose sum is σ = 1684853948970. Its totient is φ = 1684853948968.

The previous prime is 1684853948903. The next prime is 1684853948971. The reversal of 1684853948969 is 9698493584861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1684575559744 + 278389225 = 1297912^2 + 16685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1684853948969 - 2³⁶ = 1616134472233 is a prime.

It is a super-2 number, since 2×1684853948969² (a number of 25 digits) contains 22 as substring.

Together with 1684853948971, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1684853948893 and 1684853948902.

It is not a weakly prime, because it can be changed into another prime (1684853948369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842426974484 + 842426974485.

It is an arithmetic number, because the mean of its divisors is an integer number (842426974485).

Almost surely, 2^{1684853948969} is an apocalyptic number.

It is an amenable number.

1684853948969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684853948969 is an equidigital number, since it uses as much as digits as its factorization.

1684853948969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3224862720, while the sum is 80.

The spelling of 1684853948969 in words is "one trillion, six hundred eighty-four billion, eight hundred fifty-three million, nine hundred forty-eight thousand, nine hundred sixty-nine".