39717944993 has 2 divisors, whose sum is σ = 39717944994. Its totient is φ = 39717944992.

The previous prime is 39717944989. The next prime is 39717945049. The reversal of 39717944993 is 39944971793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34133671009 + 5584273984 = 184753^2 + 74728^2 .

It is a cyclic number.

It is not a de Polignac number, because 39717944993 - 2² = 39717944989 is a prime.

It is not a weakly prime, because it can be changed into another prime (39717944953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19858972496 + 19858972497.

It is an arithmetic number, because the mean of its divisors is an integer number (19858972497).

Almost surely, 2^39717944993 is an apocalyptic number.

It is an amenable number.

39717944993 is a deficient number, since it is larger than the sum of its proper divisors (1).

39717944993 is an equidigital number, since it uses as much as digits as its factorization.

39717944993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 65.

The spelling of 39717944993 in words is "thirty-nine billion, seven hundred seventeen million, nine hundred forty-four thousand, nine hundred ninety-three".