1669208065 has 8 divisors (see below), whose sum is σ = 2289199680. Its totient is φ = 1144599792.

The previous prime is 1669208059. The next prime is 1669208069. The reversal of 1669208065 is 5608029661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1669208065 - 2⁵ = 1669208033 is a prime.

It is a super-2 number, since 2×1669208065² = 5572511128522088450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1669208069) 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 7 ways as a sum of consecutive naturals, for example, 23845795 + ... + 23845864.

It is an arithmetic number, because the mean of its divisors is an integer number (286149960).

Almost surely, 2^1669208065 is an apocalyptic number.

It is an amenable number.

1669208065 is a deficient number, since it is larger than the sum of its proper divisors (619991615).

1669208065 is an equidigital number, since it uses as much as digits as its factorization.

1669208065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47691671.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1669208065 is about 40855.9428357736. The cubic root of 1669208065 is about 1186.2334276313.

The spelling of 1669208065 in words is "one billion, six hundred sixty-nine million, two hundred eight thousand, sixty-five".