1894243385669 has 2 divisors, whose sum is σ = 1894243385670. Its totient is φ = 1894243385668.

The previous prime is 1894243385659. The next prime is 1894243385717. The reversal of 1894243385669 is 9665833424981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1875634333444 + 18609052225 = 1369538^2 + 136415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1894243385669 is a prime.

It is a super-2 number, since 2×1894243385669² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1894243385599 and 1894243385608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1894243385659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 947121692834 + 947121692835.

It is an arithmetic number, because the mean of its divisors is an integer number (947121692835).

Almost surely, 2^{1894243385669} is an apocalyptic number.

It is an amenable number.

1894243385669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1894243385669 is an equidigital number, since it uses as much as digits as its factorization.

1894243385669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268738560, while the sum is 68.

The spelling of 1894243385669 in words is "one trillion, eight hundred ninety-four billion, two hundred forty-three million, three hundred eighty-five thousand, six hundred sixty-nine".