1669354441 has 4 divisors (see below), whose sum is σ = 1669444884. Its totient is φ = 1669264000.

The previous prime is 1669354397. The next prime is 1669354447. The reversal of 1669354441 is 1444539661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1444539661 = 239 ⋅6044099.

It can be written as a sum of positive squares in 2 ways, for example, as 1022720400 + 646634041 = 31980^2 + 25429^2 .

It is a 3-Lehmer number, since φ(1669354441) divides (1669354441-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1669354441 - 2¹⁹ = 1668830153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669354447) 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 in 3 ways as a sum of consecutive naturals, for example, 6460 + ... + 58141.

It is an arithmetic number, because the mean of its divisors is an integer number (417361221).

Almost surely, 2^1669354441 is an apocalyptic number.

1669354441 is the 25841-st heptagonal number.

It is an amenable number.

1669354441 is a deficient number, since it is larger than the sum of its proper divisors (90443).

1669354441 is an equidigital number, since it uses as much as digits as its factorization.

1669354441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90442.

The product of its digits is 311040, while the sum is 43.

The square root of 1669354441 is about 40857.7341638031. The cubic root of 1669354441 is about 1186.2681009658.

The spelling of 1669354441 in words is "one billion, six hundred sixty-nine million, three hundred fifty-four thousand, four hundred forty-one".