217969368481 has 8 divisors (see below), whose sum is σ = 231081737984. Its totient is φ = 205237067760.

The previous prime is 217969368457. The next prime is 217969368497. The reversal of 217969368481 is 184863969712.

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

It is a cyclic number.

It is not a de Polignac number, because 217969368481 - 2³¹ = 215821884833 is a prime.

It is a super-2 number, since 2×217969368481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217969368431) 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, 95016015 + ... + 95018308.

It is an arithmetic number, because the mean of its divisors is an integer number (28885217248).

Almost surely, 2^217969368481 is an apocalyptic number.

It is an amenable number.

217969368481 is a deficient number, since it is larger than the sum of its proper divisors (13112369503).

217969368481 is a wasteful number, since it uses less digits than its factorization.

217969368481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190034391.

The product of its digits is 31352832, while the sum is 64.

The spelling of 217969368481 in words is "two hundred seventeen billion, nine hundred sixty-nine million, three hundred sixty-eight thousand, four hundred eighty-one".