1670785169 has 2 divisors, whose sum is σ = 1670785170. Its totient is φ = 1670785168.

The previous prime is 1670785099. The next prime is 1670785183. The reversal of 1670785169 is 9615870761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1653479569 + 17305600 = 40663^2 + 4160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670785169 - 2²⁸ = 1402349713 is a prime.

It is a super-2 number, since 2×1670785169² = 5583046161900717122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1670785199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835392584 + 835392585.

It is an arithmetic number, because the mean of its divisors is an integer number (835392585).

Almost surely, 2^1670785169 is an apocalyptic number.

It is an amenable number.

1670785169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670785169 is an equidigital number, since it uses as much as digits as its factorization.

1670785169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 1670785169 is about 40875.2390696373. The cubic root of 1670785169 is about 1186.6069030609.

The spelling of 1670785169 in words is "one billion, six hundred seventy million, seven hundred eighty-five thousand, one hundred sixty-nine".