215505555197 has 2 divisors, whose sum is σ = 215505555198. Its totient is φ = 215505555196.

The previous prime is 215505555143. The next prime is 215505555289. The reversal of 215505555197 is 791555505512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129667688836 + 85837866361 = 360094^2 + 292981^2 .

It is a cyclic number.

It is not a de Polignac number, because 215505555197 - 2²⁰ = 215504506621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215505555107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107752777598 + 107752777599.

It is an arithmetic number, because the mean of its divisors is an integer number (107752777599).

Almost surely, 2^215505555197 is an apocalyptic number.

It is an amenable number.

215505555197 is a deficient number, since it is larger than the sum of its proper divisors (1).

215505555197 is an equidigital number, since it uses as much as digits as its factorization.

215505555197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1968750, while the sum is 50.

The spelling of 215505555197 in words is "two hundred fifteen billion, five hundred five million, five hundred fifty-five thousand, one hundred ninety-seven".