664984423 has 2 divisors, whose sum is σ = 664984424. Its totient is φ = 664984422.

The previous prime is 664984421. The next prime is 664984429. The reversal of 664984423 is 324489466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664984423 - 2¹ = 664984421 is a prime.

Together with 664984421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664984421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332492211 + 332492212.

It is an arithmetic number, because the mean of its divisors is an integer number (332492212).

Almost surely, 2^664984423 is an apocalyptic number.

664984423 is a deficient number, since it is larger than the sum of its proper divisors (1).

664984423 is an equidigital number, since it uses as much as digits as its factorization.

664984423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 46.

The square root of 664984423 is about 25787.2918896111. The cubic root of 664984423 is about 872.8450582205.

The spelling of 664984423 in words is "six hundred sixty-four million, nine hundred eighty-four thousand, four hundred twenty-three".