1945688750009 has 2 divisors, whose sum is σ = 1945688750010. Its totient is φ = 1945688750008.

The previous prime is 1945688749981. The next prime is 1945688750087. The reversal of 1945688750009 is 9000578865491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1898663526400 + 47025223609 = 1377920^2 + 216853^2 .

It is an emirp because it is prime and its reverse (9000578865491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1945688750009 - 2²⁴ = 1945671972793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1945688750809) 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, 972844375004 + 972844375005.

It is an arithmetic number, because the mean of its divisors is an integer number (972844375005).

Almost surely, 2^{1945688750009} is an apocalyptic number.

It is an amenable number.

1945688750009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945688750009 is an equidigital number, since it uses as much as digits as its factorization.

1945688750009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 1945688750009 in words is "one trillion, nine hundred forty-five billion, six hundred eighty-eight million, seven hundred fifty thousand, nine".