1669850909917 has 2 divisors, whose sum is σ = 1669850909918. Its totient is φ = 1669850909916.

The previous prime is 1669850909803. The next prime is 1669850909939. The reversal of 1669850909917 is 7199090589661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 875433437316 + 794417472601 = 935646^2 + 891301^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669850909917 - 2¹¹ = 1669850907869 is a prime.

It is a super-2 number, since 2×1669850909917² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669820909917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834925454958 + 834925454959.

It is an arithmetic number, because the mean of its divisors is an integer number (834925454959).

Almost surely, 2^{1669850909917} is an apocalyptic number.

It is an amenable number.

1669850909917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669850909917 is an equidigital number, since it uses as much as digits as its factorization.

1669850909917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66134880, while the sum is 70.

The spelling of 1669850909917 in words is "one trillion, six hundred sixty-nine billion, eight hundred fifty million, nine hundred nine thousand, nine hundred seventeen".