1664664503 has 4 divisors (see below), whose sum is σ = 1664750808. Its totient is φ = 1664578200.

The previous prime is 1664664457. The next prime is 1664664541. The reversal of 1664664503 is 3054664661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1664664503 - 2³⁰ = 590922679 is a prime.

It is a super-2 number, since 2×1664664503² = 5542215815096474018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664664593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500 + ... + 57702.

It is an arithmetic number, because the mean of its divisors is an integer number (416187702).

Almost surely, 2^1664664503 is an apocalyptic number.

1664664503 is a deficient number, since it is larger than the sum of its proper divisors (86305).

1664664503 is an equidigital number, since it uses as much as digits as its factorization.

1664664503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86304.

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 1664664503 is about 40800.3002807577. The cubic root of 1664664503 is about 1185.1561457554.

The spelling of 1664664503 in words is "one billion, six hundred sixty-four million, six hundred sixty-four thousand, five hundred three".