243953669597 has 4 divisors (see below), whose sum is σ = 266131275936. Its totient is φ = 221776063260.

The previous prime is 243953669593. The next prime is 243953669611. The reversal of 243953669597 is 795966359342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243953669597 - 2² = 243953669593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243953669591) 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, 11088803153 + ... + 11088803174.

It is an arithmetic number, because the mean of its divisors is an integer number (66532818984).

Almost surely, 2^243953669597 is an apocalyptic number.

It is an amenable number.

243953669597 is a deficient number, since it is larger than the sum of its proper divisors (22177606339).

243953669597 is a wasteful number, since it uses less digits than its factorization.

243953669597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22177606338.

The product of its digits is 330674400, while the sum is 68.

The spelling of 243953669597 in words is "two hundred forty-three billion, nine hundred fifty-three million, six hundred sixty-nine thousand, five hundred ninety-seven".