1665412003 has 4 divisors (see below), whose sum is σ = 1672559928. Its totient is φ = 1658264080.

The previous prime is 1665411983. The next prime is 1665412027. The reversal of 1665412003 is 3002145661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3002145661 = 4931 ⋅608831.

It is a cyclic number.

It is not a de Polignac number, because 1665412003 - 2¹³ = 1665403811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665412043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3573613 + ... + 3574078.

It is an arithmetic number, because the mean of its divisors is an integer number (418139982).

Almost surely, 2^1665412003 is an apocalyptic number.

1665412003 is a deficient number, since it is larger than the sum of its proper divisors (7147925).

1665412003 is an equidigital number, since it uses as much as digits as its factorization.

1665412003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7147924.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1665412003 is about 40809.4597244315. The cubic root of 1665412003 is about 1185.3335131565. Note that the first 3 decimals are identical.

Adding to 1665412003 its reverse (3002145661), we get a palindrome (4667557664).

The spelling of 1665412003 in words is "one billion, six hundred sixty-five million, four hundred twelve thousand, three".