1669806973 has 2 divisors, whose sum is σ = 1669806974. Its totient is φ = 1669806972.

The previous prime is 1669806961. The next prime is 1669806991. The reversal of 1669806973 is 3796089661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1547084889 + 122722084 = 39333^2 + 11078^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669806973 - 2⁹ = 1669806461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669806913) 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, 834903486 + 834903487.

It is an arithmetic number, because the mean of its divisors is an integer number (834903487).

Almost surely, 2^1669806973 is an apocalyptic number.

It is an amenable number.

1669806973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669806973 is an equidigital number, since it uses as much as digits as its factorization.

1669806973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 1669806973 is about 40863.2716874212. The cubic root of 1669806973 is about 1186.3752832719.

The spelling of 1669806973 in words is "one billion, six hundred sixty-nine million, eight hundred six thousand, nine hundred seventy-three".