1664889100939 has 2 divisors, whose sum is σ = 1664889100940. Its totient is φ = 1664889100938.

The previous prime is 1664889100933. The next prime is 1664889100981. The reversal of 1664889100939 is 9390019884661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1664889100939 - 2¹³ = 1664889092747 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664889100933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832444550469 + 832444550470.

It is an arithmetic number, because the mean of its divisors is an integer number (832444550470).

Almost surely, 2^{1664889100939} is an apocalyptic number.

1664889100939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664889100939 is an equidigital number, since it uses as much as digits as its factorization.

1664889100939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 64.

The spelling of 1664889100939 in words is "one trillion, six hundred sixty-four billion, eight hundred eighty-nine million, one hundred thousand, nine hundred thirty-nine".