664425469 has 2 divisors, whose sum is σ = 664425470. Its totient is φ = 664425468.

The previous prime is 664425457. The next prime is 664425529. The reversal of 664425469 is 964524466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651015225 + 13410244 = 25515^2 + 3662^2 .

It is a cyclic number.

It is not a de Polignac number, because 664425469 - 2¹⁹ = 663901181 is a prime.

It is a super-2 number, since 2×664425469² = 882922407711739922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664423469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332212734 + 332212735.

It is an arithmetic number, because the mean of its divisors is an integer number (332212735).

Almost surely, 2^664425469 is an apocalyptic number.

It is an amenable number.

664425469 is a deficient number, since it is larger than the sum of its proper divisors (1).

664425469 is an equidigital number, since it uses as much as digits as its factorization.

664425469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 46.

The square root of 664425469 is about 25776.4518310802. The cubic root of 664425469 is about 872.6004324418.

The spelling of 664425469 in words is "six hundred sixty-four million, four hundred twenty-five thousand, four hundred sixty-nine".