39455918197 has 2 divisors, whose sum is σ = 39455918198. Its totient is φ = 39455918196.

The previous prime is 39455918153. The next prime is 39455918207. The reversal of 39455918197 is 79181955493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32778740401 + 6677177796 = 181049^2 + 81714^2 .

It is an emirp because it is prime and its reverse (79181955493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39455918197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39455918107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19727959098 + 19727959099.

It is an arithmetic number, because the mean of its divisors is an integer number (19727959099).

Almost surely, 2^39455918197 is an apocalyptic number.

It is an amenable number.

39455918197 is a deficient number, since it is larger than the sum of its proper divisors (1).

39455918197 is an equidigital number, since it uses as much as digits as its factorization.

39455918197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12247200, while the sum is 61.

The spelling of 39455918197 in words is "thirty-nine billion, four hundred fifty-five million, nine hundred eighteen thousand, one hundred ninety-seven".