1664273423 has 2 divisors, whose sum is σ = 1664273424. Its totient is φ = 1664273422.

The previous prime is 1664273411. The next prime is 1664273437. The reversal of 1664273423 is 3243724661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1664273423 - 2⁸ = 1664273167 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664273453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832136711 + 832136712.

It is an arithmetic number, because the mean of its divisors is an integer number (832136712).

Almost surely, 2^1664273423 is an apocalyptic number.

1664273423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664273423 is an equidigital number, since it uses as much as digits as its factorization.

1664273423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 38.

The square root of 1664273423 is about 40795.5073874563. The cubic root of 1664273423 is about 1185.0633288213.

The spelling of 1664273423 in words is "one billion, six hundred sixty-four million, two hundred seventy-three thousand, four hundred twenty-three".