1669534849 has 4 divisors (see below), whose sum is σ = 1670214064. Its totient is φ = 1668855636.

The previous prime is 1669534847. The next prime is 1669534903. The reversal of 1669534849 is 9484359661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9484359661 = 7 ⋅1354908523.

It is a cyclic number.

It is not a de Polignac number, because 1669534849 - 2¹ = 1669534847 is a prime.

It is a super-2 number, since 2×1669534849² = 5574693224050905602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1669534849.

It is not an unprimeable number, because it can be changed into a prime (1669534847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335907 + ... + 340840.

It is an arithmetic number, because the mean of its divisors is an integer number (417553516).

Almost surely, 2^1669534849 is an apocalyptic number.

It is an amenable number.

1669534849 is a deficient number, since it is larger than the sum of its proper divisors (679215).

1669534849 is an equidigital number, since it uses as much as digits as its factorization.

1669534849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679214.

The product of its digits is 5598720, while the sum is 55.

The square root of 1669534849 is about 40859.9418624158. The cubic root of 1669534849 is about 1186.3108329628.

The spelling of 1669534849 in words is "one billion, six hundred sixty-nine million, five hundred thirty-four thousand, eight hundred forty-nine".