1664445023 has 2 divisors, whose sum is σ = 1664445024. Its totient is φ = 1664445022.

The previous prime is 1664444941. The next prime is 1664445073. The reversal of 1664445023 is 3205444661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664445023 - 2¹⁰ = 1664443999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664445073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832222511 + 832222512.

It is an arithmetic number, because the mean of its divisors is an integer number (832222512).

Almost surely, 2^1664445023 is an apocalyptic number.

1664445023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664445023 is an equidigital number, since it uses as much as digits as its factorization.

1664445023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1664445023 is about 40797.6105060088. The cubic root of 1664445023 is about 1185.1040572809.

Adding to 1664445023 its reverse (3205444661), we get a palindrome (4869889684).

The spelling of 1664445023 in words is "one billion, six hundred sixty-four million, four hundred forty-five thousand, twenty-three".