217490769165 has 16 divisors (see below), whose sum is σ = 352752153408. Its totient is φ = 114406102656.

The previous prime is 217490769163. The next prime is 217490769233. The reversal of 217490769165 is 561967094712.

It is a happy number.

217490769165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217490769165 - 2¹ = 217490769163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217490769163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99309759 + ... + 99311948.

It is an arithmetic number, because the mean of its divisors is an integer number (22047009588).

Almost surely, 2^217490769165 is an apocalyptic number.

It is an amenable number.

217490769165 is a deficient number, since it is larger than the sum of its proper divisors (135261384243).

217490769165 is a wasteful number, since it uses less digits than its factorization.

217490769165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198621788.

The product of its (nonzero) digits is 5715360, while the sum is 57.

The spelling of 217490769165 in words is "two hundred seventeen billion, four hundred ninety million, seven hundred sixty-nine thousand, one hundred sixty-five".