217150379165 has 8 divisors (see below), whose sum is σ = 260582964408. Its totient is φ = 173718630400.

The previous prime is 217150379153. The next prime is 217150379167. The reversal of 217150379165 is 561973051712.

It can be written as a sum of positive squares in 4 ways, for example, as 12895192249 + 204255186916 = 113557^2 + 451946^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217150379165 - 2¹⁰ = 217150378141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217150379167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845789 + ... + 1072221.

It is an arithmetic number, because the mean of its divisors is an integer number (32572870551).

Almost surely, 2^217150379165 is an apocalyptic number.

It is an amenable number.

217150379165 is a deficient number, since it is larger than the sum of its proper divisors (43432585243).

217150379165 is a wasteful number, since it uses less digits than its factorization.

217150379165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418239.

The product of its (nonzero) digits is 396900, while the sum is 47.

The spelling of 217150379165 in words is "two hundred seventeen billion, one hundred fifty million, three hundred seventy-nine thousand, one hundred sixty-five".