1669288321 has 2 divisors, whose sum is σ = 1669288322. Its totient is φ = 1669288320.

The previous prime is 1669288303. The next prime is 1669288333. The reversal of 1669288321 is 1238829661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1563095296 + 106193025 = 39536^2 + 10305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669288321 is a prime.

It is a super-3 number, since 3×1669288321³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1669288351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834644160 + 834644161.

It is an arithmetic number, because the mean of its divisors is an integer number (834644161).

Almost surely, 2^1669288321 is an apocalyptic number.

It is an amenable number.

1669288321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669288321 is an equidigital number, since it uses as much as digits as its factorization.

1669288321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 1669288321 is about 40856.9250066620. The cubic root of 1669288321 is about 1186.2524388071.

The spelling of 1669288321 in words is "one billion, six hundred sixty-nine million, two hundred eighty-eight thousand, three hundred twenty-one".