1665419345 has 4 divisors (see below), whose sum is σ = 1998503220. Its totient is φ = 1332335472.

The previous prime is 1665419311. The next prime is 1665419347. The reversal of 1665419345 is 5439145661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 573315136 + 1092104209 = 23944^2 + 33047^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665419345 - 2⁶ = 1665419281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1665419296 and 1665419305.

It is not an unprimeable number, because it can be changed into a prime (1665419347) 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, 166541930 + ... + 166541939.

It is an arithmetic number, because the mean of its divisors is an integer number (499625805).

Almost surely, 2^1665419345 is an apocalyptic number.

It is an amenable number.

1665419345 is a deficient number, since it is larger than the sum of its proper divisors (333083875).

1665419345 is an equidigital number, since it uses as much as digits as its factorization.

1665419345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333083874.

The product of its digits is 388800, while the sum is 44.

The square root of 1665419345 is about 40809.5496789661. The cubic root of 1665419345 is about 1185.3352550089.

The spelling of 1665419345 in words is "one billion, six hundred sixty-five million, four hundred nineteen thousand, three hundred forty-five".