664269439 has 2 divisors, whose sum is σ = 664269440. Its totient is φ = 664269438.

The previous prime is 664269433. The next prime is 664269449. The reversal of 664269439 is 934962466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664269439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664269392 and 664269401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664269433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332134719 + 332134720.

It is an arithmetic number, because the mean of its divisors is an integer number (332134720).

Almost surely, 2^664269439 is an apocalyptic number.

664269439 is a deficient number, since it is larger than the sum of its proper divisors (1).

664269439 is an equidigital number, since it uses as much as digits as its factorization.

664269439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 49.

The square root of 664269439 is about 25773.4250537254. The cubic root of 664269439 is about 872.5321215422.

The spelling of 664269439 in words is "six hundred sixty-four million, two hundred sixty-nine thousand, four hundred thirty-nine".