1664315023 has 4 divisors (see below), whose sum is σ = 1902074320. Its totient is φ = 1426555728.

The previous prime is 1664315021. The next prime is 1664315053. The reversal of 1664315023 is 3205134661.

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

It is a cyclic number.

It is not a de Polignac number, because 1664315023 - 2¹ = 1664315021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664315021) 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, 118879638 + ... + 118879651.

It is an arithmetic number, because the mean of its divisors is an integer number (475518580).

Almost surely, 2^1664315023 is an apocalyptic number.

1664315023 is a deficient number, since it is larger than the sum of its proper divisors (237759297).

1664315023 is an equidigital number, since it uses as much as digits as its factorization.

1664315023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237759296.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1664315023 is about 40796.0172443340. The cubic root of 1664315023 is about 1185.0732026443.

Adding to 1664315023 its reverse (3205134661), we get a palindrome (4869449684).

The spelling of 1664315023 in words is "one billion, six hundred sixty-four million, three hundred fifteen thousand, twenty-three".