1669813849 has 16 divisors (see below), whose sum is σ = 1836950976. Its totient is φ = 1505275200.

The previous prime is 1669813829. The next prime is 1669813889. The reversal of 1669813849 is 9483189661.

It is not a de Polignac number, because 1669813849 - 2⁷ = 1669813721 is a prime.

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 1669813849.

It is not an unprimeable number, because it can be changed into a prime (1669813829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1634959 + ... + 1635979.

It is an arithmetic number, because the mean of its divisors is an integer number (114809436).

Almost surely, 2^1669813849 is an apocalyptic number.

It is an amenable number.

1669813849 is a deficient number, since it is larger than the sum of its proper divisors (167137127).

1669813849 is a wasteful number, since it uses less digits than its factorization.

1669813849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136.

The product of its digits is 2239488, while the sum is 55.

The square root of 1669813849 is about 40863.3558215671. The cubic root of 1669813849 is about 1186.3769117046.

It can be divided in two parts, 1669 and 813849, that added together give a palindrome (815518).

The spelling of 1669813849 in words is "one billion, six hundred sixty-nine million, eight hundred thirteen thousand, eight hundred forty-nine".