217413263285 has 8 divisors (see below), whose sum is σ = 261911076696. Its totient is φ = 173253836800.

The previous prime is 217413263237. The next prime is 217413263297. The reversal of 217413263285 is 582362314712.

It can be written as a sum of positive squares in 4 ways, for example, as 111891588004 + 105521675281 = 334502^2 + 324841^2 .

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

It is not a de Polignac number, because 217413263285 - 2¹⁴ = 217413246901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84595316 + ... + 84597885.

It is an arithmetic number, because the mean of its divisors is an integer number (32738884587).

Almost surely, 2^217413263285 is an apocalyptic number.

It is an amenable number.

217413263285 is a deficient number, since it is larger than the sum of its proper divisors (44497813411).

217413263285 is a wasteful number, since it uses less digits than its factorization.

217413263285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169193463.

The product of its digits is 483840, while the sum is 44.

Adding to 217413263285 its reverse (582362314712), we get a palindrome (799775577997).

The spelling of 217413263285 in words is "two hundred seventeen billion, four hundred thirteen million, two hundred sixty-three thousand, two hundred eighty-five".