39916656709 has 2 divisors, whose sum is σ = 39916656710. Its totient is φ = 39916656708.

The previous prime is 39916656701. The next prime is 39916656719. The reversal of 39916656709 is 90765661993.

39916656709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34263120609 + 5653536100 = 185103^2 + 75190^2 .

It is an emirp because it is prime and its reverse (90765661993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39916656709 - 2³ = 39916656701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39916656701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19958328354 + 19958328355.

It is an arithmetic number, because the mean of its divisors is an integer number (19958328355).

Almost surely, 2^39916656709 is an apocalyptic number.

It is an amenable number.

39916656709 is a deficient number, since it is larger than the sum of its proper divisors (1).

39916656709 is an equidigital number, since it uses as much as digits as its factorization.

39916656709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16533720, while the sum is 61.

The spelling of 39916656709 in words is "thirty-nine billion, nine hundred sixteen million, six hundred fifty-six thousand, seven hundred nine".