243213465717617 has 4 divisors (see below), whose sum is σ = 243221494449780. Its totient is φ = 243205436985456.

The previous prime is 243213465717611. The next prime is 243213465717671. The reversal of 243213465717617 is 716717564312342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152520622805776 + 90692842911841 = 12349924^2 + 9523279^2 .

It is a cyclic number.

It is not a de Polignac number, because 243213465717617 - 2²⁴ = 243213448940401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243213465717611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4014320642 + ... + 4014381227.

It is an arithmetic number, because the mean of its divisors is an integer number (60805373612445).

Almost surely, 2^{243213465717617} is an apocalyptic number.

It is an amenable number.

243213465717617 is a deficient number, since it is larger than the sum of its proper divisors (8028732163).

243213465717617 is an equidigital number, since it uses as much as digits as its factorization.

243213465717617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8028732162.

The product of its digits is 35562240, while the sum is 59.

The spelling of 243213465717617 in words is "two hundred forty-three trillion, two hundred thirteen billion, four hundred sixty-five million, seven hundred seventeen thousand, six hundred seventeen".