39768433849 has 2 divisors, whose sum is σ = 39768433850. Its totient is φ = 39768433848.

The previous prime is 39768433847. The next prime is 39768433867. The reversal of 39768433849 is 94833486793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38825943849 + 942490000 = 197043^2 + 30700^2 .

It is a cyclic number.

It is not a de Polignac number, because 39768433849 - 2¹ = 39768433847 is a prime.

Together with 39768433847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39768433847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19884216924 + 19884216925.

It is an arithmetic number, because the mean of its divisors is an integer number (19884216925).

Almost surely, 2^39768433849 is an apocalyptic number.

It is an amenable number.

39768433849 is a deficient number, since it is larger than the sum of its proper divisors (1).

39768433849 is an equidigital number, since it uses as much as digits as its factorization.

39768433849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94058496, while the sum is 64.

The spelling of 39768433849 in words is "thirty-nine billion, seven hundred sixty-eight million, four hundred thirty-three thousand, eight hundred forty-nine".