215945950189 has 2 divisors, whose sum is σ = 215945950190. Its totient is φ = 215945950188.

The previous prime is 215945950159. The next prime is 215945950237. The reversal of 215945950189 is 981059549512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215918208900 + 27741289 = 464670^2 + 5267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215945950189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215945950109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107972975094 + 107972975095.

It is an arithmetic number, because the mean of its divisors is an integer number (107972975095).

Almost surely, 2^215945950189 is an apocalyptic number.

It is an amenable number.

215945950189 is a deficient number, since it is larger than the sum of its proper divisors (1).

215945950189 is an equidigital number, since it uses as much as digits as its factorization.

215945950189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832000, while the sum is 58.

The spelling of 215945950189 in words is "two hundred fifteen billion, nine hundred forty-five million, nine hundred fifty thousand, one hundred eighty-nine".