243522645497 has 4 divisors (see below), whose sum is σ = 243580397556. Its totient is φ = 243464893440.

The previous prime is 243522645481. The next prime is 243522645557. The reversal of 243522645497 is 794546225342.

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 114850498816 + 128672146681 = 338896^2 + 358709^2 .

It is a cyclic number.

It is not a de Polignac number, because 243522645497 - 2⁴ = 243522645481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243522645697) 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, 28869704 + ... + 28878137.

It is an arithmetic number, because the mean of its divisors is an integer number (60895099389).

Almost surely, 2^243522645497 is an apocalyptic number.

It is an amenable number.

243522645497 is a deficient number, since it is larger than the sum of its proper divisors (57752059).

243522645497 is an equidigital number, since it uses as much as digits as its factorization.

243522645497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57752058.

The product of its digits is 14515200, while the sum is 53.

The spelling of 243522645497 in words is "two hundred forty-three billion, five hundred twenty-two million, six hundred forty-five thousand, four hundred ninety-seven".