1664140003 has 4 divisors (see below), whose sum is σ = 1666918800. Its totient is φ = 1661361208.

The previous prime is 1664139989. The next prime is 1664140019. The reversal of 1664140003 is 3000414661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664140003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664140003.

It is not an unprimeable number, because it can be changed into a prime (1664140043) 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, 1388500 + ... + 1389697.

It is an arithmetic number, because the mean of its divisors is an integer number (416729700).

Almost surely, 2^1664140003 is an apocalyptic number.

1664140003 is a deficient number, since it is larger than the sum of its proper divisors (2778797).

1664140003 is an equidigital number, since it uses as much as digits as its factorization.

1664140003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778796.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1664140003 is about 40793.8721256024. The cubic root of 1664140003 is about 1185.0316602720.

Adding to 1664140003 its reverse (3000414661), we get a palindrome (4664554664).

It can be divided in two parts, 16641 and 40003, that added together give a square (56644 = 238²).

The spelling of 1664140003 in words is "one billion, six hundred sixty-four million, one hundred forty thousand, three".