197885921138137 has 2 divisors, whose sum is σ = 197885921138138. Its totient is φ = 197885921138136.

The previous prime is 197885921138123. The next prime is 197885921138237. The reversal of 197885921138137 is 731831129588791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151375103364681 + 46510817773456 = 12303459^2 + 6819884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197885921138137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197885921138137.

It is not a weakly prime, because it can be changed into another prime (197885921138237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98942960569068 + 98942960569069.

It is an arithmetic number, because the mean of its divisors is an integer number (98942960569069).

Almost surely, 2^{197885921138137} is an apocalyptic number.

It is an amenable number.

197885921138137 is a deficient number, since it is larger than the sum of its proper divisors (1).

197885921138137 is an equidigital number, since it uses as much as digits as its factorization.

197885921138137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 182891520, while the sum is 73.

The spelling of 197885921138137 in words is "one hundred ninety-seven trillion, eight hundred eighty-five billion, nine hundred twenty-one million, one hundred thirty-eight thousand, one hundred thirty-seven".