1664242339 has 2 divisors, whose sum is σ = 1664242340. Its totient is φ = 1664242338.

The previous prime is 1664242331. The next prime is 1664242381. The reversal of 1664242339 is 9332424661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1664242339 - 2³ = 1664242331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664242331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832121169 + 832121170.

It is an arithmetic number, because the mean of its divisors is an integer number (832121170).

Almost surely, 2^1664242339 is an apocalyptic number.

1664242339 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664242339 is an equidigital number, since it uses as much as digits as its factorization.

1664242339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 40.

The square root of 1664242339 is about 40795.1264123547. The cubic root of 1664242339 is about 1185.0559508794.

The spelling of 1664242339 in words is "one billion, six hundred sixty-four million, two hundred forty-two thousand, three hundred thirty-nine".