39664912242649 has 2 divisors, whose sum is σ = 39664912242650. Its totient is φ = 39664912242648.

The previous prime is 39664912242569. The next prime is 39664912242667. The reversal of 39664912242649 is 94624221946693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23948103942400 + 15716808300249 = 4893680^2 + 3964443^2 .

It is a cyclic number.

It is not a de Polignac number, because 39664912242649 - 2¹¹ = 39664912240601 is a prime.

It is not a weakly prime, because it can be changed into another prime (39664912240649) 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, 19832456121324 + 19832456121325.

It is an arithmetic number, because the mean of its divisors is an integer number (19832456121325).

Almost surely, 2^{39664912242649} is an apocalyptic number.

It is an amenable number.

39664912242649 is a deficient number, since it is larger than the sum of its proper divisors (1).

39664912242649 is an equidigital number, since it uses as much as digits as its factorization.

39664912242649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241864704, while the sum is 67.

The spelling of 39664912242649 in words is "thirty-nine trillion, six hundred sixty-four billion, nine hundred twelve million, two hundred forty-two thousand, six hundred forty-nine".