1669890349 has 2 divisors, whose sum is σ = 1669890350. Its totient is φ = 1669890348.

The previous prime is 1669890323. The next prime is 1669890377. The reversal of 1669890349 is 9430989661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1578075625 + 91814724 = 39725^2 + 9582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669890349 - 2⁵ = 1669890317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1669890349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669890319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834945174 + 834945175.

It is an arithmetic number, because the mean of its divisors is an integer number (834945175).

Almost surely, 2^1669890349 is an apocalyptic number.

It is an amenable number.

1669890349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669890349 is an equidigital number, since it uses as much as digits as its factorization.

1669890349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 1669890349 is about 40864.2918573172. The cubic root of 1669890349 is about 1186.3950287836.

The spelling of 1669890349 in words is "one billion, six hundred sixty-nine million, eight hundred ninety thousand, three hundred forty-nine".