39649169909 has 2 divisors, whose sum is σ = 39649169910. Its totient is φ = 39649169908.

The previous prime is 39649169821. The next prime is 39649169951. The reversal of 39649169909 is 90996194693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39589060900 + 60109009 = 198970^2 + 7753^2 .

It is a cyclic number.

It is not a de Polignac number, because 39649169909 - 2⁸ = 39649169653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39649163909) 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, 19824584954 + 19824584955.

It is an arithmetic number, because the mean of its divisors is an integer number (19824584955).

Almost surely, 2^39649169909 is an apocalyptic number.

It is an amenable number.

39649169909 is a deficient number, since it is larger than the sum of its proper divisors (1).

39649169909 is an equidigital number, since it uses as much as digits as its factorization.

39649169909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25509168, while the sum is 65.

The spelling of 39649169909 in words is "thirty-nine billion, six hundred forty-nine million, one hundred sixty-nine thousand, nine hundred nine".