39991817624497 has 2 divisors, whose sum is σ = 39991817624498. Its totient is φ = 39991817624496.

The previous prime is 39991817624461. The next prime is 39991817624501. The reversal of 39991817624497 is 79442671819993.

39991817624497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39018524883361 + 973292741136 = 6246481^2 + 986556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39991817624497 is a prime.

It is a super-2 number, since 2×39991817624497² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39991817625497) 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, 19995908812248 + 19995908812249.

It is an arithmetic number, because the mean of its divisors is an integer number (19995908812249).

Almost surely, 2^{39991817624497} is an apocalyptic number.

It is an amenable number.

39991817624497 is a deficient number, since it is larger than the sum of its proper divisors (1).

39991817624497 is an equidigital number, since it uses as much as digits as its factorization.

39991817624497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481421312, while the sum is 79.

The spelling of 39991817624497 in words is "thirty-nine trillion, nine hundred ninety-one billion, eight hundred seventeen million, six hundred twenty-four thousand, four hundred ninety-seven".