243365562321605 has 4 divisors (see below), whose sum is σ = 292038674785932. Its totient is φ = 194692449857280.

The previous prime is 243365562321593. The next prime is 243365562321611. The reversal of 243365562321605 is 506123265563342.

It is a happy number.

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 97856372648644 + 145509189672961 = 9892238^2 + 12062719^2 .

It is not a de Polignac number, because 243365562321605 - 2²² = 243365558127301 is a prime.

It is a super-2 number, since 2×243365562321605² (a number of 30 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 24336556232156 + ... + 24336556232165.

It is an arithmetic number, because the mean of its divisors is an integer number (73009668696483).

Almost surely, 2^{243365562321605} is an apocalyptic number.

It is an amenable number.

243365562321605 is a deficient number, since it is larger than the sum of its proper divisors (48673112464327).

243365562321605 is an equidigital number, since it uses as much as digits as its factorization.

243365562321605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48673112464326.

The product of its (nonzero) digits is 23328000, while the sum is 53.

The spelling of 243365562321605 in words is "two hundred forty-three trillion, three hundred sixty-five billion, five hundred sixty-two million, three hundred twenty-one thousand, six hundred five".