1664001439 has 2 divisors, whose sum is σ = 1664001440. Its totient is φ = 1664001438.

The previous prime is 1664001397. The next prime is 1664001461. The reversal of 1664001439 is 9341004661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664001439 - 2⁹ = 1664000927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664001499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832000719 + 832000720.

It is an arithmetic number, because the mean of its divisors is an integer number (832000720).

Almost surely, 2^1664001439 is an apocalyptic number.

1664001439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664001439 is an equidigital number, since it uses as much as digits as its factorization.

1664001439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1664001439 is about 40792.1737469334. The cubic root of 1664001439 is about 1184.9987689519.

The spelling of 1664001439 in words is "one billion, six hundred sixty-four million, one thousand, four hundred thirty-nine".